2 * linux/fs/isofs/inode.c
4 * (C) 1991 Linus Torvalds - minix filesystem
5 * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem.
6 * 1994 Eberhard Mönkeberg - multi session handling.
7 * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
8 * 1997 Gordon Chaffee - Joliet CDs
9 * 1998 Eric Lammerts - ISO 9660 Level 3
10 * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB
11 * 2004 Paul Serice - NFS Export Operations
14 #include <linux/init.h>
15 #include <linux/module.h>
17 #include <linux/slab.h>
18 #include <linux/nls.h>
19 #include <linux/ctype.h>
20 #include <linux/smp_lock.h>
21 #include <linux/statfs.h>
22 #include <linux/cdrom.h>
23 #include <linux/parser.h>
30 static int isofs_hashi(struct dentry *parent, struct qstr *qstr);
31 static int isofs_hash(struct dentry *parent, struct qstr *qstr);
32 static int isofs_dentry_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b);
33 static int isofs_dentry_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b);
36 static int isofs_hashi_ms(struct dentry *parent, struct qstr *qstr);
37 static int isofs_hash_ms(struct dentry *parent, struct qstr *qstr);
38 static int isofs_dentry_cmpi_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
39 static int isofs_dentry_cmp_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
42 static void isofs_put_super(struct super_block *sb)
44 struct isofs_sb_info *sbi = ISOFS_SB(sb);
49 unload_nls(sbi->s_nls_iocharset);
59 static int isofs_read_inode(struct inode *);
60 static int isofs_statfs (struct dentry *, struct kstatfs *);
62 static struct kmem_cache *isofs_inode_cachep;
64 static struct inode *isofs_alloc_inode(struct super_block *sb)
66 struct iso_inode_info *ei;
67 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
70 return &ei->vfs_inode;
73 static void isofs_destroy_inode(struct inode *inode)
75 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
78 static void init_once(void *foo)
80 struct iso_inode_info *ei = foo;
82 inode_init_once(&ei->vfs_inode);
85 static int init_inodecache(void)
87 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
88 sizeof(struct iso_inode_info),
89 0, (SLAB_RECLAIM_ACCOUNT|
92 if (isofs_inode_cachep == NULL)
97 static void destroy_inodecache(void)
99 kmem_cache_destroy(isofs_inode_cachep);
102 static int isofs_remount(struct super_block *sb, int *flags, char *data)
104 /* we probably want a lot more here */
109 static const struct super_operations isofs_sops = {
110 .alloc_inode = isofs_alloc_inode,
111 .destroy_inode = isofs_destroy_inode,
112 .put_super = isofs_put_super,
113 .statfs = isofs_statfs,
114 .remount_fs = isofs_remount,
115 .show_options = generic_show_options,
119 static const struct dentry_operations isofs_dentry_ops[] = {
121 .d_hash = isofs_hash,
122 .d_compare = isofs_dentry_cmp,
125 .d_hash = isofs_hashi,
126 .d_compare = isofs_dentry_cmpi,
130 .d_hash = isofs_hash_ms,
131 .d_compare = isofs_dentry_cmp_ms,
134 .d_hash = isofs_hashi_ms,
135 .d_compare = isofs_dentry_cmpi_ms,
140 struct iso9660_options{
142 unsigned int joliet:1;
143 unsigned int cruft:1;
145 unsigned int showassoc:1;
146 unsigned int nocompress:1;
147 unsigned int overriderockperm:1;
148 unsigned int uid_set:1;
149 unsigned int gid_set:1;
153 unsigned int blocksize;
165 * Compute the hash for the isofs name corresponding to the dentry.
168 isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
176 while (len && name[len-1] == '.')
180 qstr->hash = full_name_hash(name, len);
186 * Compute the hash for the isofs name corresponding to the dentry.
189 isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
199 while (len && name[len-1] == '.')
203 hash = init_name_hash();
205 c = tolower(*name++);
206 hash = partial_name_hash(c, hash);
208 qstr->hash = end_name_hash(hash);
214 * Case insensitive compare of two isofs names.
216 static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a,
217 struct qstr *b, int ms)
221 /* A filename cannot end in '.' or we treat it like it has none */
225 while (alen && a->name[alen-1] == '.')
227 while (blen && b->name[blen-1] == '.')
231 if (strnicmp(a->name, b->name, alen) == 0)
238 * Case sensitive compare of two isofs names.
240 static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a,
241 struct qstr *b, int ms)
245 /* A filename cannot end in '.' or we treat it like it has none */
249 while (alen && a->name[alen-1] == '.')
251 while (blen && b->name[blen-1] == '.')
255 if (strncmp(a->name, b->name, alen) == 0)
262 isofs_hash(struct dentry *dentry, struct qstr *qstr)
264 return isofs_hash_common(dentry, qstr, 0);
268 isofs_hashi(struct dentry *dentry, struct qstr *qstr)
270 return isofs_hashi_common(dentry, qstr, 0);
274 isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
276 return isofs_dentry_cmp_common(dentry, a, b, 0);
280 isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
282 return isofs_dentry_cmpi_common(dentry, a, b, 0);
287 isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
289 return isofs_hash_common(dentry, qstr, 1);
293 isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
295 return isofs_hashi_common(dentry, qstr, 1);
299 isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
301 return isofs_dentry_cmp_common(dentry, a, b, 1);
305 isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
307 return isofs_dentry_cmpi_common(dentry, a, b, 1);
312 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
313 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
314 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
315 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
318 static const match_table_t tokens = {
319 {Opt_norock, "norock"},
320 {Opt_nojoliet, "nojoliet"},
321 {Opt_unhide, "unhide"},
323 {Opt_showassoc, "showassoc"},
324 {Opt_cruft, "cruft"},
326 {Opt_iocharset, "iocharset=%s"},
327 {Opt_map_a, "map=acorn"},
328 {Opt_map_a, "map=a"},
329 {Opt_map_n, "map=normal"},
330 {Opt_map_n, "map=n"},
331 {Opt_map_o, "map=off"},
332 {Opt_map_o, "map=o"},
333 {Opt_session, "session=%u"},
334 {Opt_sb, "sbsector=%u"},
335 {Opt_check_r, "check=relaxed"},
336 {Opt_check_r, "check=r"},
337 {Opt_check_s, "check=strict"},
338 {Opt_check_s, "check=s"},
341 {Opt_mode, "mode=%u"},
342 {Opt_dmode, "dmode=%u"},
343 {Opt_overriderockperm, "overriderockperm"},
344 {Opt_block, "block=%u"},
345 {Opt_ignore, "conv=binary"},
346 {Opt_ignore, "conv=b"},
347 {Opt_ignore, "conv=text"},
348 {Opt_ignore, "conv=t"},
349 {Opt_ignore, "conv=mtext"},
350 {Opt_ignore, "conv=m"},
351 {Opt_ignore, "conv=auto"},
352 {Opt_ignore, "conv=a"},
353 {Opt_nocompress, "nocompress"},
357 static int parse_options(char *options, struct iso9660_options *popt)
368 popt->check = 'u'; /* unset */
369 popt->nocompress = 0;
370 popt->blocksize = 1024;
371 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
376 popt->iocharset = NULL;
378 popt->overriderockperm = 0;
384 while ((p = strsep(&options, ",")) != NULL) {
386 substring_t args[MAX_OPT_ARGS];
392 token = match_token(p, tokens, args);
415 popt->iocharset = match_strdup(&args[0]);
428 if (match_int(&args[0], &option))
433 popt->session = n + 1;
436 if (match_int(&args[0], &option))
438 popt->sbsector = option;
449 if (match_int(&args[0], &option))
455 if (match_int(&args[0], &option))
461 if (match_int(&args[0], &option))
463 popt->fmode = option;
466 if (match_int(&args[0], &option))
468 popt->dmode = option;
470 case Opt_overriderockperm:
471 popt->overriderockperm = 1;
474 if (match_int(&args[0], &option))
477 if (n != 512 && n != 1024 && n != 2048)
482 popt->nocompress = 1;
492 * look if the driver can tell the multi session redirection value
494 * don't change this if you don't know what you do, please!
495 * Multisession is legal only with XA disks.
496 * A non-XA disk with more than one volume descriptor may do it right, but
497 * usually is written in a nowhere standardized "multi-partition" manner.
498 * Multisession uses absolute addressing (solely the first frame of the whole
499 * track is #0), multi-partition uses relative addressing (each first frame of
500 * each track is #0), and a track is not a session.
502 * A broken CDwriter software or drive firmware does not set new standards,
503 * at least not if conflicting with the existing ones.
507 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
509 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
511 struct cdrom_multisession ms_info;
512 unsigned int vol_desc_start;
513 struct block_device *bdev = sb->s_bdev;
517 ms_info.addr_format=CDROM_LBA;
518 if(session >= 0 && session <= 99) {
519 struct cdrom_tocentry Te;
520 Te.cdte_track=session;
521 Te.cdte_format=CDROM_LBA;
522 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
524 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
525 session, Te.cdte_addr.lba,
526 Te.cdte_ctrl&CDROM_DATA_TRACK);
527 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
528 return Te.cdte_addr.lba;
531 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
533 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
535 printk(KERN_ERR "ISOFS: Invalid session number\n");
537 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
539 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
540 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
544 #if WE_OBEY_THE_WRITTEN_STANDARDS
545 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
547 vol_desc_start=ms_info.addr.lba;
548 return vol_desc_start;
552 * Initialize the superblock and read the root inode.
554 * Note: a check_disk_change() has been done immediately prior
555 * to this call, so we don't need to check again.
557 static int isofs_fill_super(struct super_block *s, void *data, int silent)
559 struct buffer_head *bh = NULL, *pri_bh = NULL;
560 struct hs_primary_descriptor *h_pri = NULL;
561 struct iso_primary_descriptor *pri = NULL;
562 struct iso_supplementary_descriptor *sec = NULL;
563 struct iso_directory_record *rootp;
565 struct iso9660_options opt;
566 struct isofs_sb_info *sbi;
567 unsigned long first_data_zone;
568 int joliet_level = 0;
569 int iso_blknum, block;
571 int table, error = -EINVAL;
572 unsigned int vol_desc_start;
574 save_mount_options(s, data);
576 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
581 if (!parse_options((char *)data, &opt))
585 * First of all, get the hardware blocksize for this device.
586 * If we don't know what it is, or the hardware blocksize is
587 * larger than the blocksize the user specified, then use
591 * What if bugger tells us to go beyond page size?
593 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
595 sbi->s_high_sierra = 0; /* default is iso9660 */
597 vol_desc_start = (opt.sbsector != -1) ?
598 opt.sbsector : isofs_get_last_session(s,opt.session);
600 for (iso_blknum = vol_desc_start+16;
601 iso_blknum < vol_desc_start+100; iso_blknum++) {
602 struct hs_volume_descriptor *hdp;
603 struct iso_volume_descriptor *vdp;
605 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
606 if (!(bh = sb_bread(s, block)))
609 vdp = (struct iso_volume_descriptor *)bh->b_data;
610 hdp = (struct hs_volume_descriptor *)bh->b_data;
613 * Due to the overlapping physical location of the descriptors,
614 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
615 * proper identification in this case, we first check for ISO.
617 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
618 if (isonum_711(vdp->type) == ISO_VD_END)
620 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
622 pri = (struct iso_primary_descriptor *)vdp;
623 /* Save the buffer in case we need it ... */
629 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
630 sec = (struct iso_supplementary_descriptor *)vdp;
631 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
633 if (sec->escape[2] == 0x40)
635 else if (sec->escape[2] == 0x43)
637 else if (sec->escape[2] == 0x45)
640 printk(KERN_DEBUG "ISO 9660 Extensions: "
641 "Microsoft Joliet Level %d\n",
646 /* Unknown supplementary volume descriptor */
652 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
653 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
656 sbi->s_high_sierra = 1;
658 h_pri = (struct hs_primary_descriptor *)vdp;
663 /* Just skip any volume descriptors we don't recognize */
669 * If we fall through, either no volume descriptor was found,
670 * or else we passed a primary descriptor looking for others.
673 goto out_unknown_format;
680 if (joliet_level && (pri == NULL || !opt.rock)) {
681 /* This is the case of Joliet with the norock mount flag.
682 * A disc with both Joliet and Rock Ridge is handled later
684 pri = (struct iso_primary_descriptor *) sec;
687 if(sbi->s_high_sierra){
688 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
689 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
690 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
691 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
695 rootp = (struct iso_directory_record *) pri->root_directory_record;
696 sbi->s_nzones = isonum_733(pri->volume_space_size);
697 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
698 sbi->s_max_size = isonum_733(pri->volume_space_size);
701 sbi->s_ninodes = 0; /* No way to figure this out easily */
703 orig_zonesize = sbi->s_log_zone_size;
705 * If the zone size is smaller than the hardware sector size,
706 * this is a fatal error. This would occur if the disc drive
707 * had sectors that were 2048 bytes, but the filesystem had
708 * blocks that were 512 bytes (which should only very rarely
711 if (orig_zonesize < opt.blocksize)
714 /* RDE: convert log zone size to bit shift */
715 switch (sbi->s_log_zone_size) {
716 case 512: sbi->s_log_zone_size = 9; break;
717 case 1024: sbi->s_log_zone_size = 10; break;
718 case 2048: sbi->s_log_zone_size = 11; break;
721 goto out_bad_zone_size;
724 s->s_magic = ISOFS_SUPER_MAGIC;
725 s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */
728 * The CDROM is read-only, has no nodes (devices) on it, and since
729 * all of the files appear to be owned by root, we really do not want
730 * to allow suid. (suid or devices will not show up unless we have
731 * Rock Ridge extensions)
734 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
736 /* Set this for reference. Its not currently used except on write
737 which we don't have .. */
739 first_data_zone = isonum_733(rootp->extent) +
740 isonum_711(rootp->ext_attr_length);
741 sbi->s_firstdatazone = first_data_zone;
743 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
744 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
745 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
746 if(sbi->s_high_sierra)
747 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
751 * If the Joliet level is set, we _may_ decide to use the
752 * secondary descriptor, but can't be sure until after we
753 * read the root inode. But before reading the root inode
754 * we may need to change the device blocksize, and would
755 * rather release the old buffer first. So, we cache the
756 * first_data_zone value from the secondary descriptor.
759 pri = (struct iso_primary_descriptor *) sec;
760 rootp = (struct iso_directory_record *)
761 pri->root_directory_record;
762 first_data_zone = isonum_733(rootp->extent) +
763 isonum_711(rootp->ext_attr_length);
767 * We're all done using the volume descriptor, and may need
768 * to change the device blocksize, so release the buffer now.
774 * Force the blocksize to 512 for 512 byte sectors. The file
775 * read primitives really get it wrong in a bad way if we don't
778 * Note - we should never be setting the blocksize to something
779 * less than the hardware sector size for the device. If we
780 * do, we would end up having to read larger buffers and split
781 * out portions to satisfy requests.
783 * Note2- the idea here is that we want to deal with the optimal
784 * zonesize in the filesystem. If we have it set to something less,
785 * then we have horrible problems with trying to piece together
786 * bits of adjacent blocks in order to properly read directory
787 * entries. By forcing the blocksize in this way, we ensure
788 * that we will never be required to do this.
790 sb_set_blocksize(s, orig_zonesize);
792 sbi->s_nls_iocharset = NULL;
795 if (joliet_level && opt.utf8 == 0) {
796 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
797 sbi->s_nls_iocharset = load_nls(p);
798 if (! sbi->s_nls_iocharset) {
799 /* Fail only if explicit charset specified */
802 sbi->s_nls_iocharset = load_nls_default();
806 s->s_op = &isofs_sops;
807 s->s_export_op = &isofs_export_ops;
808 sbi->s_mapping = opt.map;
809 sbi->s_rock = (opt.rock ? 2 : 0);
810 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
811 sbi->s_cruft = opt.cruft;
812 sbi->s_hide = opt.hide;
813 sbi->s_showassoc = opt.showassoc;
814 sbi->s_uid = opt.uid;
815 sbi->s_gid = opt.gid;
816 sbi->s_uid_set = opt.uid_set;
817 sbi->s_gid_set = opt.gid_set;
818 sbi->s_utf8 = opt.utf8;
819 sbi->s_nocompress = opt.nocompress;
820 sbi->s_overriderockperm = opt.overriderockperm;
822 * It would be incredibly stupid to allow people to mark every file
823 * on the disk as suid, so we merely allow them to set the default
826 if (opt.fmode != ISOFS_INVALID_MODE)
827 sbi->s_fmode = opt.fmode & 0777;
829 sbi->s_fmode = ISOFS_INVALID_MODE;
830 if (opt.dmode != ISOFS_INVALID_MODE)
831 sbi->s_dmode = opt.dmode & 0777;
833 sbi->s_dmode = ISOFS_INVALID_MODE;
836 * Read the root inode, which _may_ result in changing
837 * the s_rock flag. Once we have the final s_rock value,
838 * we then decide whether to use the Joliet descriptor.
840 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
845 * If this disk has both Rock Ridge and Joliet on it, then we
846 * want to use Rock Ridge by default. This can be overridden
847 * by using the norock mount option. There is still one other
848 * possibility that is not taken into account: a Rock Ridge
849 * CD with Unicode names. Until someone sees such a beast, it
850 * will not be supported.
852 if (sbi->s_rock == 1) {
854 } else if (joliet_level) {
856 if (sbi->s_firstdatazone != first_data_zone) {
857 sbi->s_firstdatazone = first_data_zone;
859 "ISOFS: changing to secondary root\n");
861 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
867 if (opt.check == 'u') {
868 /* Only Joliet is case insensitive by default */
874 sbi->s_joliet_level = joliet_level;
876 /* Make sure the root inode is a directory */
877 if (!S_ISDIR(inode->i_mode)) {
879 "isofs_fill_super: root inode is not a directory. "
880 "Corrupted media?\n");
884 /* get the root dentry */
885 s->s_root = d_alloc_root(inode);
892 if (opt.check == 'r')
894 s->s_root->d_op = &isofs_dentry_ops[table];
896 kfree(opt.iocharset);
901 * Display error messages and free resources.
907 error = PTR_ERR(inode);
908 if (error != -ENOMEM)
909 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
912 unload_nls(sbi->s_nls_iocharset);
916 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
917 __func__, s->s_id, iso_blknum, block);
920 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
921 sbi->s_log_zone_size);
924 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
925 orig_zonesize, opt.blocksize);
929 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
934 kfree(opt.iocharset);
940 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
942 struct super_block *sb = dentry->d_sb;
943 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
945 buf->f_type = ISOFS_SUPER_MAGIC;
946 buf->f_bsize = sb->s_blocksize;
947 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
948 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
951 buf->f_files = ISOFS_SB(sb)->s_ninodes;
953 buf->f_fsid.val[0] = (u32)id;
954 buf->f_fsid.val[1] = (u32)(id >> 32);
955 buf->f_namelen = NAME_MAX;
960 * Get a set of blocks; filling in buffer_heads if already allocated
961 * or getblk() if they are not. Returns the number of blocks inserted
964 int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
965 struct buffer_head **bh, unsigned long nblocks)
968 unsigned offset, sect_size;
969 unsigned int firstext;
970 unsigned long nextblk, nextoff;
971 long iblock = (long)iblock_s;
972 int section, rv, error;
973 struct iso_inode_info *ei = ISOFS_I(inode);
979 if (iblock < 0 || iblock != iblock_s) {
980 printk(KERN_DEBUG "%s: block number too large\n", __func__);
987 firstext = ei->i_first_extent;
988 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
989 nextblk = ei->i_next_section_block;
990 nextoff = ei->i_next_section_offset;
994 /* If we are *way* beyond the end of the file, print a message.
995 * Access beyond the end of the file up to the next page boundary
996 * is normal, however because of the way the page cache works.
997 * In this case, we just return 0 so that we can properly fill
998 * the page with useless information without generating any
1001 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
1002 printk(KERN_DEBUG "%s: block >= EOF (%ld, %ld)\n",
1003 __func__, iblock, (unsigned long) inode->i_size);
1007 /* On the last section, nextblk == 0, section size is likely to
1008 * exceed sect_size by a partial block, and access beyond the
1009 * end of the file will reach beyond the section size, too.
1011 while (nextblk && (b_off >= (offset + sect_size))) {
1012 struct inode *ninode;
1014 offset += sect_size;
1015 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
1016 if (IS_ERR(ninode)) {
1017 error = PTR_ERR(ninode);
1020 firstext = ISOFS_I(ninode)->i_first_extent;
1021 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1022 nextblk = ISOFS_I(ninode)->i_next_section_block;
1023 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1026 if (++section > 100) {
1027 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1028 " aborting...\n", __func__);
1029 printk(KERN_DEBUG "%s: block=%ld firstext=%u sect_size=%u "
1030 "nextblk=%lu nextoff=%lu\n", __func__,
1031 iblock, firstext, (unsigned) sect_size,
1038 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1040 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1044 bh++; /* Next buffer head */
1045 b_off++; /* Next buffer offset */
1053 return rv != 0 ? rv : error;
1057 * Used by the standard interfaces.
1059 static int isofs_get_block(struct inode *inode, sector_t iblock,
1060 struct buffer_head *bh_result, int create)
1065 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1069 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1070 return ret < 0 ? ret : 0;
1073 static int isofs_bmap(struct inode *inode, sector_t block)
1075 struct buffer_head dummy;
1079 dummy.b_blocknr = -1000;
1080 error = isofs_get_block(inode, block, &dummy, 0);
1082 return dummy.b_blocknr;
1086 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1088 sector_t blknr = isofs_bmap(inode, block);
1091 return sb_bread(inode->i_sb, blknr);
1094 static int isofs_readpage(struct file *file, struct page *page)
1096 return block_read_full_page(page,isofs_get_block);
1099 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1101 return generic_block_bmap(mapping,block,isofs_get_block);
1104 static const struct address_space_operations isofs_aops = {
1105 .readpage = isofs_readpage,
1106 .sync_page = block_sync_page,
1110 static int isofs_read_level3_size(struct inode *inode)
1112 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1113 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1114 struct buffer_head *bh = NULL;
1115 unsigned long block, offset, block_saved, offset_saved;
1117 int more_entries = 0;
1118 struct iso_directory_record *tmpde = NULL;
1119 struct iso_inode_info *ei = ISOFS_I(inode);
1123 /* The first 16 blocks are reserved as the System Area. Thus,
1124 * no inodes can appear in block 0. We use this to flag that
1125 * this is the last section. */
1126 ei->i_next_section_block = 0;
1127 ei->i_next_section_offset = 0;
1129 block = ei->i_iget5_block;
1130 offset = ei->i_iget5_offset;
1133 struct iso_directory_record *de;
1134 unsigned int de_len;
1137 bh = sb_bread(inode->i_sb, block);
1141 de = (struct iso_directory_record *) (bh->b_data + offset);
1142 de_len = *(unsigned char *) de;
1152 block_saved = block;
1153 offset_saved = offset;
1156 /* Make sure we have a full directory entry */
1157 if (offset >= bufsize) {
1158 int slop = bufsize - offset + de_len;
1160 tmpde = kmalloc(256, GFP_KERNEL);
1164 memcpy(tmpde, de, slop);
1165 offset &= bufsize - 1;
1170 bh = sb_bread(inode->i_sb, block);
1173 memcpy((void *)tmpde+slop, bh->b_data, offset);
1178 inode->i_size += isonum_733(de->size);
1180 ei->i_next_section_block = block_saved;
1181 ei->i_next_section_offset = offset_saved;
1184 more_entries = de->flags[-high_sierra] & 0x80;
1189 } while (more_entries);
1202 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1207 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1208 "isofs_read_level3_size: inode=%lu\n",
1209 __func__, inode->i_ino);
1213 static int isofs_read_inode(struct inode *inode)
1215 struct super_block *sb = inode->i_sb;
1216 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1217 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1218 unsigned long block;
1219 int high_sierra = sbi->s_high_sierra;
1220 struct buffer_head *bh = NULL;
1221 struct iso_directory_record *de;
1222 struct iso_directory_record *tmpde = NULL;
1223 unsigned int de_len;
1224 unsigned long offset;
1225 struct iso_inode_info *ei = ISOFS_I(inode);
1228 block = ei->i_iget5_block;
1229 bh = sb_bread(inode->i_sb, block);
1233 offset = ei->i_iget5_offset;
1235 de = (struct iso_directory_record *) (bh->b_data + offset);
1236 de_len = *(unsigned char *) de;
1238 if (offset + de_len > bufsize) {
1239 int frag1 = bufsize - offset;
1241 tmpde = kmalloc(de_len, GFP_KERNEL);
1242 if (tmpde == NULL) {
1243 printk(KERN_INFO "%s: out of memory\n", __func__);
1247 memcpy(tmpde, bh->b_data + offset, frag1);
1249 bh = sb_bread(inode->i_sb, ++block);
1252 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1256 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1258 ISOFS_BUFFER_BITS(inode));
1260 /* Assume it is a normal-format file unless told otherwise */
1261 ei->i_file_format = isofs_file_normal;
1263 if (de->flags[-high_sierra] & 2) {
1264 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1265 inode->i_mode = S_IFDIR | sbi->s_dmode;
1267 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
1268 inode->i_nlink = 1; /*
1269 * Set to 1. We know there are 2, but
1270 * the find utility tries to optimize
1271 * if it is 2, and it screws up. It is
1272 * easier to give 1 which tells find to
1273 * do it the hard way.
1276 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1277 inode->i_mode = S_IFREG | sbi->s_fmode;
1280 * Set default permissions: r-x for all. The disc
1281 * could be shared with DOS machines so virtually
1282 * anything could be a valid executable.
1284 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1288 inode->i_uid = sbi->s_uid;
1289 inode->i_gid = sbi->s_gid;
1290 inode->i_blocks = 0;
1292 ei->i_format_parm[0] = 0;
1293 ei->i_format_parm[1] = 0;
1294 ei->i_format_parm[2] = 0;
1296 ei->i_section_size = isonum_733(de->size);
1297 if (de->flags[-high_sierra] & 0x80) {
1298 ret = isofs_read_level3_size(inode);
1303 ei->i_next_section_block = 0;
1304 ei->i_next_section_offset = 0;
1305 inode->i_size = isonum_733(de->size);
1309 * Some dipshit decided to store some other bit of information
1310 * in the high byte of the file length. Truncate size in case
1311 * this CDROM was mounted with the cruft option.
1315 inode->i_size &= 0x00ffffff;
1317 if (de->interleave[0]) {
1318 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1322 /* I have no idea what file_unit_size is used for, so
1323 we will flag it for now */
1324 if (de->file_unit_size[0] != 0) {
1325 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1329 /* I have no idea what other flag bits are used for, so
1330 we will flag it for now */
1332 if((de->flags[-high_sierra] & ~2)!= 0){
1333 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1335 inode->i_ino, de->flags[-high_sierra]);
1339 inode->i_mtime.tv_sec =
1340 inode->i_atime.tv_sec =
1341 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1342 inode->i_mtime.tv_nsec =
1343 inode->i_atime.tv_nsec =
1344 inode->i_ctime.tv_nsec = 0;
1346 ei->i_first_extent = (isonum_733(de->extent) +
1347 isonum_711(de->ext_attr_length));
1349 /* Set the number of blocks for stat() - should be done before RR */
1350 inode->i_blocks = (inode->i_size + 511) >> 9;
1353 * Now test for possible Rock Ridge extensions which will override
1354 * some of these numbers in the inode structure.
1358 parse_rock_ridge_inode(de, inode);
1359 /* if we want uid/gid set, override the rock ridge setting */
1361 inode->i_uid = sbi->s_uid;
1363 inode->i_gid = sbi->s_gid;
1365 /* Now set final access rights if overriding rock ridge setting */
1366 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1367 sbi->s_dmode != ISOFS_INVALID_MODE)
1368 inode->i_mode = S_IFDIR | sbi->s_dmode;
1369 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1370 sbi->s_fmode != ISOFS_INVALID_MODE)
1371 inode->i_mode = S_IFREG | sbi->s_fmode;
1373 /* Install the inode operations vector */
1374 if (S_ISREG(inode->i_mode)) {
1375 inode->i_fop = &generic_ro_fops;
1376 switch (ei->i_file_format) {
1377 #ifdef CONFIG_ZISOFS
1378 case isofs_file_compressed:
1379 inode->i_data.a_ops = &zisofs_aops;
1383 inode->i_data.a_ops = &isofs_aops;
1386 } else if (S_ISDIR(inode->i_mode)) {
1387 inode->i_op = &isofs_dir_inode_operations;
1388 inode->i_fop = &isofs_dir_operations;
1389 } else if (S_ISLNK(inode->i_mode)) {
1390 inode->i_op = &page_symlink_inode_operations;
1391 inode->i_data.a_ops = &isofs_symlink_aops;
1393 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1394 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1404 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1409 struct isofs_iget5_callback_data {
1410 unsigned long block;
1411 unsigned long offset;
1414 static int isofs_iget5_test(struct inode *ino, void *data)
1416 struct iso_inode_info *i = ISOFS_I(ino);
1417 struct isofs_iget5_callback_data *d =
1418 (struct isofs_iget5_callback_data*)data;
1419 return (i->i_iget5_block == d->block)
1420 && (i->i_iget5_offset == d->offset);
1423 static int isofs_iget5_set(struct inode *ino, void *data)
1425 struct iso_inode_info *i = ISOFS_I(ino);
1426 struct isofs_iget5_callback_data *d =
1427 (struct isofs_iget5_callback_data*)data;
1428 i->i_iget5_block = d->block;
1429 i->i_iget5_offset = d->offset;
1433 /* Store, in the inode's containing structure, the block and block
1434 * offset that point to the underlying meta-data for the inode. The
1435 * code below is otherwise similar to the iget() code in
1436 * include/linux/fs.h */
1437 struct inode *isofs_iget(struct super_block *sb,
1438 unsigned long block,
1439 unsigned long offset)
1441 unsigned long hashval;
1442 struct inode *inode;
1443 struct isofs_iget5_callback_data data;
1446 if (offset >= 1ul << sb->s_blocksize_bits)
1447 return ERR_PTR(-EINVAL);
1450 data.offset = offset;
1452 hashval = (block << sb->s_blocksize_bits) | offset;
1454 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1455 &isofs_iget5_set, &data);
1458 return ERR_PTR(-ENOMEM);
1460 if (inode->i_state & I_NEW) {
1461 ret = isofs_read_inode(inode);
1464 inode = ERR_PTR(ret);
1466 unlock_new_inode(inode);
1473 static int isofs_get_sb(struct file_system_type *fs_type,
1474 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1476 return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super,
1480 static struct file_system_type iso9660_fs_type = {
1481 .owner = THIS_MODULE,
1483 .get_sb = isofs_get_sb,
1484 .kill_sb = kill_block_super,
1485 .fs_flags = FS_REQUIRES_DEV,
1488 static int __init init_iso9660_fs(void)
1490 int err = init_inodecache();
1493 #ifdef CONFIG_ZISOFS
1494 err = zisofs_init();
1498 err = register_filesystem(&iso9660_fs_type);
1503 #ifdef CONFIG_ZISOFS
1507 destroy_inodecache();
1512 static void __exit exit_iso9660_fs(void)
1514 unregister_filesystem(&iso9660_fs_type);
1515 #ifdef CONFIG_ZISOFS
1518 destroy_inodecache();
1521 module_init(init_iso9660_fs)
1522 module_exit(exit_iso9660_fs)
1523 MODULE_LICENSE("GPL");
1524 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1525 MODULE_ALIAS("iso9660");