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);
46 if (sbi->s_nls_iocharset) {
47 unload_nls(sbi->s_nls_iocharset);
48 sbi->s_nls_iocharset = NULL;
57 static int isofs_read_inode(struct inode *);
58 static int isofs_statfs (struct dentry *, struct kstatfs *);
60 static struct kmem_cache *isofs_inode_cachep;
62 static struct inode *isofs_alloc_inode(struct super_block *sb)
64 struct iso_inode_info *ei;
65 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
68 return &ei->vfs_inode;
71 static void isofs_destroy_inode(struct inode *inode)
73 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
76 static void init_once(struct kmem_cache *cachep, void *foo)
78 struct iso_inode_info *ei = foo;
80 inode_init_once(&ei->vfs_inode);
83 static int init_inodecache(void)
85 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
86 sizeof(struct iso_inode_info),
87 0, (SLAB_RECLAIM_ACCOUNT|
90 if (isofs_inode_cachep == NULL)
95 static void destroy_inodecache(void)
97 kmem_cache_destroy(isofs_inode_cachep);
100 static int isofs_remount(struct super_block *sb, int *flags, char *data)
102 /* we probably want a lot more here */
107 static const struct super_operations isofs_sops = {
108 .alloc_inode = isofs_alloc_inode,
109 .destroy_inode = isofs_destroy_inode,
110 .put_super = isofs_put_super,
111 .statfs = isofs_statfs,
112 .remount_fs = isofs_remount,
116 static struct dentry_operations isofs_dentry_ops[] = {
118 .d_hash = isofs_hash,
119 .d_compare = isofs_dentry_cmp,
122 .d_hash = isofs_hashi,
123 .d_compare = isofs_dentry_cmpi,
127 .d_hash = isofs_hash_ms,
128 .d_compare = isofs_dentry_cmp_ms,
131 .d_hash = isofs_hashi_ms,
132 .d_compare = isofs_dentry_cmpi_ms,
137 struct iso9660_options{
146 unsigned int blocksize;
158 * Compute the hash for the isofs name corresponding to the dentry.
161 isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
169 while (len && name[len-1] == '.')
173 qstr->hash = full_name_hash(name, len);
179 * Compute the hash for the isofs name corresponding to the dentry.
182 isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
192 while (len && name[len-1] == '.')
196 hash = init_name_hash();
198 c = tolower(*name++);
199 hash = partial_name_hash(c, hash);
201 qstr->hash = end_name_hash(hash);
207 * Case insensitive compare of two isofs names.
209 static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a,
210 struct qstr *b, int ms)
214 /* A filename cannot end in '.' or we treat it like it has none */
218 while (alen && a->name[alen-1] == '.')
220 while (blen && b->name[blen-1] == '.')
224 if (strnicmp(a->name, b->name, alen) == 0)
231 * Case sensitive compare of two isofs names.
233 static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a,
234 struct qstr *b, int ms)
238 /* A filename cannot end in '.' or we treat it like it has none */
242 while (alen && a->name[alen-1] == '.')
244 while (blen && b->name[blen-1] == '.')
248 if (strncmp(a->name, b->name, alen) == 0)
255 isofs_hash(struct dentry *dentry, struct qstr *qstr)
257 return isofs_hash_common(dentry, qstr, 0);
261 isofs_hashi(struct dentry *dentry, struct qstr *qstr)
263 return isofs_hashi_common(dentry, qstr, 0);
267 isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
269 return isofs_dentry_cmp_common(dentry, a, b, 0);
273 isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
275 return isofs_dentry_cmpi_common(dentry, a, b, 0);
280 isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
282 return isofs_hash_common(dentry, qstr, 1);
286 isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
288 return isofs_hashi_common(dentry, qstr, 1);
292 isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
294 return isofs_dentry_cmp_common(dentry, a, b, 1);
298 isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
300 return isofs_dentry_cmpi_common(dentry, a, b, 1);
305 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
306 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
307 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
308 Opt_nocompress, Opt_hide, Opt_showassoc,
311 static match_table_t tokens = {
312 {Opt_norock, "norock"},
313 {Opt_nojoliet, "nojoliet"},
314 {Opt_unhide, "unhide"},
316 {Opt_showassoc, "showassoc"},
317 {Opt_cruft, "cruft"},
319 {Opt_iocharset, "iocharset=%s"},
320 {Opt_map_a, "map=acorn"},
321 {Opt_map_a, "map=a"},
322 {Opt_map_n, "map=normal"},
323 {Opt_map_n, "map=n"},
324 {Opt_map_o, "map=off"},
325 {Opt_map_o, "map=o"},
326 {Opt_session, "session=%u"},
327 {Opt_sb, "sbsector=%u"},
328 {Opt_check_r, "check=relaxed"},
329 {Opt_check_r, "check=r"},
330 {Opt_check_s, "check=strict"},
331 {Opt_check_s, "check=s"},
334 {Opt_mode, "mode=%u"},
335 {Opt_block, "block=%u"},
336 {Opt_ignore, "conv=binary"},
337 {Opt_ignore, "conv=b"},
338 {Opt_ignore, "conv=text"},
339 {Opt_ignore, "conv=t"},
340 {Opt_ignore, "conv=mtext"},
341 {Opt_ignore, "conv=m"},
342 {Opt_ignore, "conv=auto"},
343 {Opt_ignore, "conv=a"},
344 {Opt_nocompress, "nocompress"},
348 static int parse_options(char *options, struct iso9660_options *popt)
358 popt->showassoc = 'n';
359 popt->check = 'u'; /* unset */
360 popt->nocompress = 0;
361 popt->blocksize = 1024;
362 popt->mode = S_IRUGO | S_IXUGO; /*
363 * r-x for all. The disc could
364 * be shared with DOS machines so
365 * virtually anything could be
366 * a valid executable.
370 popt->iocharset = NULL;
377 while ((p = strsep(&options, ",")) != NULL) {
379 substring_t args[MAX_OPT_ARGS];
385 token = match_token(p, tokens, args);
398 popt->showassoc = 'y';
408 popt->iocharset = match_strdup(&args[0]);
421 if (match_int(&args[0], &option))
426 popt->session = n + 1;
429 if (match_int(&args[0], &option))
431 popt->sbsector = option;
442 if (match_int(&args[0], &option))
447 if (match_int(&args[0], &option))
452 if (match_int(&args[0], &option))
457 if (match_int(&args[0], &option))
460 if (n != 512 && n != 1024 && n != 2048)
465 popt->nocompress = 1;
475 * look if the driver can tell the multi session redirection value
477 * don't change this if you don't know what you do, please!
478 * Multisession is legal only with XA disks.
479 * A non-XA disk with more than one volume descriptor may do it right, but
480 * usually is written in a nowhere standardized "multi-partition" manner.
481 * Multisession uses absolute addressing (solely the first frame of the whole
482 * track is #0), multi-partition uses relative addressing (each first frame of
483 * each track is #0), and a track is not a session.
485 * A broken CDwriter software or drive firmware does not set new standards,
486 * at least not if conflicting with the existing ones.
490 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
492 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
494 struct cdrom_multisession ms_info;
495 unsigned int vol_desc_start;
496 struct block_device *bdev = sb->s_bdev;
500 ms_info.addr_format=CDROM_LBA;
501 if(session >= 0 && session <= 99) {
502 struct cdrom_tocentry Te;
503 Te.cdte_track=session;
504 Te.cdte_format=CDROM_LBA;
505 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
507 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
508 session, Te.cdte_addr.lba,
509 Te.cdte_ctrl&CDROM_DATA_TRACK);
510 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
511 return Te.cdte_addr.lba;
514 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
516 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
518 printk(KERN_ERR "ISOFS: Invalid session number\n");
520 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
522 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
523 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
527 #if WE_OBEY_THE_WRITTEN_STANDARDS
528 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
530 vol_desc_start=ms_info.addr.lba;
531 return vol_desc_start;
535 * Initialize the superblock and read the root inode.
537 * Note: a check_disk_change() has been done immediately prior
538 * to this call, so we don't need to check again.
540 static int isofs_fill_super(struct super_block *s, void *data, int silent)
542 struct buffer_head *bh = NULL, *pri_bh = NULL;
543 struct hs_primary_descriptor *h_pri = NULL;
544 struct iso_primary_descriptor *pri = NULL;
545 struct iso_supplementary_descriptor *sec = NULL;
546 struct iso_directory_record *rootp;
548 struct iso9660_options opt;
549 struct isofs_sb_info *sbi;
550 unsigned long first_data_zone;
551 int joliet_level = 0;
552 int iso_blknum, block;
554 int table, error = -EINVAL;
555 unsigned int vol_desc_start;
557 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
562 if (!parse_options((char *)data, &opt))
566 * First of all, get the hardware blocksize for this device.
567 * If we don't know what it is, or the hardware blocksize is
568 * larger than the blocksize the user specified, then use
572 * What if bugger tells us to go beyond page size?
574 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
576 sbi->s_high_sierra = 0; /* default is iso9660 */
578 vol_desc_start = (opt.sbsector != -1) ?
579 opt.sbsector : isofs_get_last_session(s,opt.session);
581 for (iso_blknum = vol_desc_start+16;
582 iso_blknum < vol_desc_start+100; iso_blknum++) {
583 struct hs_volume_descriptor *hdp;
584 struct iso_volume_descriptor *vdp;
586 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
587 if (!(bh = sb_bread(s, block)))
590 vdp = (struct iso_volume_descriptor *)bh->b_data;
591 hdp = (struct hs_volume_descriptor *)bh->b_data;
594 * Due to the overlapping physical location of the descriptors,
595 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
596 * proper identification in this case, we first check for ISO.
598 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
599 if (isonum_711(vdp->type) == ISO_VD_END)
601 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
603 pri = (struct iso_primary_descriptor *)vdp;
604 /* Save the buffer in case we need it ... */
610 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
611 sec = (struct iso_supplementary_descriptor *)vdp;
612 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
613 if (opt.joliet == 'y') {
614 if (sec->escape[2] == 0x40)
616 else if (sec->escape[2] == 0x43)
618 else if (sec->escape[2] == 0x45)
621 printk(KERN_DEBUG "ISO 9660 Extensions: "
622 "Microsoft Joliet Level %d\n",
627 /* Unknown supplementary volume descriptor */
633 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
634 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
637 sbi->s_high_sierra = 1;
639 h_pri = (struct hs_primary_descriptor *)vdp;
644 /* Just skip any volume descriptors we don't recognize */
650 * If we fall through, either no volume descriptor was found,
651 * or else we passed a primary descriptor looking for others.
654 goto out_unknown_format;
661 if (joliet_level && (pri == NULL || opt.rock == 'n')) {
662 /* This is the case of Joliet with the norock mount flag.
663 * A disc with both Joliet and Rock Ridge is handled later
665 pri = (struct iso_primary_descriptor *) sec;
668 if(sbi->s_high_sierra){
669 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
670 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
671 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
672 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
676 rootp = (struct iso_directory_record *) pri->root_directory_record;
677 sbi->s_nzones = isonum_733(pri->volume_space_size);
678 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
679 sbi->s_max_size = isonum_733(pri->volume_space_size);
682 sbi->s_ninodes = 0; /* No way to figure this out easily */
684 orig_zonesize = sbi->s_log_zone_size;
686 * If the zone size is smaller than the hardware sector size,
687 * this is a fatal error. This would occur if the disc drive
688 * had sectors that were 2048 bytes, but the filesystem had
689 * blocks that were 512 bytes (which should only very rarely
692 if (orig_zonesize < opt.blocksize)
695 /* RDE: convert log zone size to bit shift */
696 switch (sbi->s_log_zone_size) {
697 case 512: sbi->s_log_zone_size = 9; break;
698 case 1024: sbi->s_log_zone_size = 10; break;
699 case 2048: sbi->s_log_zone_size = 11; break;
702 goto out_bad_zone_size;
705 s->s_magic = ISOFS_SUPER_MAGIC;
706 s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */
709 * The CDROM is read-only, has no nodes (devices) on it, and since
710 * all of the files appear to be owned by root, we really do not want
711 * to allow suid. (suid or devices will not show up unless we have
712 * Rock Ridge extensions)
715 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
717 /* Set this for reference. Its not currently used except on write
718 which we don't have .. */
720 first_data_zone = isonum_733(rootp->extent) +
721 isonum_711(rootp->ext_attr_length);
722 sbi->s_firstdatazone = first_data_zone;
724 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
725 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
726 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
727 if(sbi->s_high_sierra)
728 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
732 * If the Joliet level is set, we _may_ decide to use the
733 * secondary descriptor, but can't be sure until after we
734 * read the root inode. But before reading the root inode
735 * we may need to change the device blocksize, and would
736 * rather release the old buffer first. So, we cache the
737 * first_data_zone value from the secondary descriptor.
740 pri = (struct iso_primary_descriptor *) sec;
741 rootp = (struct iso_directory_record *)
742 pri->root_directory_record;
743 first_data_zone = isonum_733(rootp->extent) +
744 isonum_711(rootp->ext_attr_length);
748 * We're all done using the volume descriptor, and may need
749 * to change the device blocksize, so release the buffer now.
755 * Force the blocksize to 512 for 512 byte sectors. The file
756 * read primitives really get it wrong in a bad way if we don't
759 * Note - we should never be setting the blocksize to something
760 * less than the hardware sector size for the device. If we
761 * do, we would end up having to read larger buffers and split
762 * out portions to satisfy requests.
764 * Note2- the idea here is that we want to deal with the optimal
765 * zonesize in the filesystem. If we have it set to something less,
766 * then we have horrible problems with trying to piece together
767 * bits of adjacent blocks in order to properly read directory
768 * entries. By forcing the blocksize in this way, we ensure
769 * that we will never be required to do this.
771 sb_set_blocksize(s, orig_zonesize);
773 sbi->s_nls_iocharset = NULL;
776 if (joliet_level && opt.utf8 == 0) {
777 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
778 sbi->s_nls_iocharset = load_nls(p);
779 if (! sbi->s_nls_iocharset) {
780 /* Fail only if explicit charset specified */
783 sbi->s_nls_iocharset = load_nls_default();
787 s->s_op = &isofs_sops;
788 s->s_export_op = &isofs_export_ops;
789 sbi->s_mapping = opt.map;
790 sbi->s_rock = (opt.rock == 'y' ? 2 : 0);
791 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
792 sbi->s_cruft = opt.cruft;
793 sbi->s_hide = opt.hide;
794 sbi->s_showassoc = opt.showassoc;
795 sbi->s_uid = opt.uid;
796 sbi->s_gid = opt.gid;
797 sbi->s_utf8 = opt.utf8;
798 sbi->s_nocompress = opt.nocompress;
800 * It would be incredibly stupid to allow people to mark every file
801 * on the disk as suid, so we merely allow them to set the default
804 sbi->s_mode = opt.mode & 0777;
807 * Read the root inode, which _may_ result in changing
808 * the s_rock flag. Once we have the final s_rock value,
809 * we then decide whether to use the Joliet descriptor.
811 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
816 * If this disk has both Rock Ridge and Joliet on it, then we
817 * want to use Rock Ridge by default. This can be overridden
818 * by using the norock mount option. There is still one other
819 * possibility that is not taken into account: a Rock Ridge
820 * CD with Unicode names. Until someone sees such a beast, it
821 * will not be supported.
823 if (sbi->s_rock == 1) {
825 } else if (joliet_level) {
827 if (sbi->s_firstdatazone != first_data_zone) {
828 sbi->s_firstdatazone = first_data_zone;
830 "ISOFS: changing to secondary root\n");
832 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
838 if (opt.check == 'u') {
839 /* Only Joliet is case insensitive by default */
845 sbi->s_joliet_level = joliet_level;
847 /* check the root inode */
851 /* Make sure the root inode is a directory */
852 if (!S_ISDIR(inode->i_mode)) {
854 "isofs_fill_super: root inode is not a directory. "
855 "Corrupted media?\n");
859 /* get the root dentry */
860 s->s_root = d_alloc_root(inode);
867 if (opt.check == 'r')
869 s->s_root->d_op = &isofs_dentry_ops[table];
871 kfree(opt.iocharset);
876 * Display error messages and free resources.
879 printk(KERN_WARNING "%s: root inode not initialized\n", __func__);
884 error = PTR_ERR(inode);
885 if (error != -ENOMEM)
886 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
889 if (sbi->s_nls_iocharset)
890 unload_nls(sbi->s_nls_iocharset);
894 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
895 __func__, s->s_id, iso_blknum, block);
898 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
899 sbi->s_log_zone_size);
902 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
903 orig_zonesize, opt.blocksize);
907 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
912 kfree(opt.iocharset);
918 static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
920 struct super_block *sb = dentry->d_sb;
922 buf->f_type = ISOFS_SUPER_MAGIC;
923 buf->f_bsize = sb->s_blocksize;
924 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
925 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
928 buf->f_files = ISOFS_SB(sb)->s_ninodes;
930 buf->f_namelen = NAME_MAX;
935 * Get a set of blocks; filling in buffer_heads if already allocated
936 * or getblk() if they are not. Returns the number of blocks inserted
939 int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
940 struct buffer_head **bh, unsigned long nblocks)
943 unsigned offset, sect_size;
944 unsigned int firstext;
945 unsigned long nextblk, nextoff;
946 long iblock = (long)iblock_s;
947 int section, rv, error;
948 struct iso_inode_info *ei = ISOFS_I(inode);
954 if (iblock < 0 || iblock != iblock_s) {
955 printk(KERN_DEBUG "%s: block number too large\n", __func__);
962 firstext = ei->i_first_extent;
963 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
964 nextblk = ei->i_next_section_block;
965 nextoff = ei->i_next_section_offset;
969 /* If we are *way* beyond the end of the file, print a message.
970 * Access beyond the end of the file up to the next page boundary
971 * is normal, however because of the way the page cache works.
972 * In this case, we just return 0 so that we can properly fill
973 * the page with useless information without generating any
976 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
977 printk(KERN_DEBUG "%s: block >= EOF (%ld, %ld)\n",
978 __func__, iblock, (unsigned long) inode->i_size);
982 /* On the last section, nextblk == 0, section size is likely to
983 * exceed sect_size by a partial block, and access beyond the
984 * end of the file will reach beyond the section size, too.
986 while (nextblk && (b_off >= (offset + sect_size))) {
987 struct inode *ninode;
990 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
991 if (IS_ERR(ninode)) {
992 error = PTR_ERR(ninode);
995 firstext = ISOFS_I(ninode)->i_first_extent;
996 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
997 nextblk = ISOFS_I(ninode)->i_next_section_block;
998 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1001 if (++section > 100) {
1002 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1003 " aborting...\n", __func__);
1004 printk(KERN_DEBUG "%s: block=%ld firstext=%u sect_size=%u "
1005 "nextblk=%lu nextoff=%lu\n", __func__,
1006 iblock, firstext, (unsigned) sect_size,
1013 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1015 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
1019 bh++; /* Next buffer head */
1020 b_off++; /* Next buffer offset */
1028 return rv != 0 ? rv : error;
1032 * Used by the standard interfaces.
1034 static int isofs_get_block(struct inode *inode, sector_t iblock,
1035 struct buffer_head *bh_result, int create)
1040 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
1044 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1045 return ret < 0 ? ret : 0;
1048 static int isofs_bmap(struct inode *inode, sector_t block)
1050 struct buffer_head dummy;
1054 dummy.b_blocknr = -1000;
1055 error = isofs_get_block(inode, block, &dummy, 0);
1057 return dummy.b_blocknr;
1061 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1063 sector_t blknr = isofs_bmap(inode, block);
1066 return sb_bread(inode->i_sb, blknr);
1069 static int isofs_readpage(struct file *file, struct page *page)
1071 return block_read_full_page(page,isofs_get_block);
1074 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1076 return generic_block_bmap(mapping,block,isofs_get_block);
1079 static const struct address_space_operations isofs_aops = {
1080 .readpage = isofs_readpage,
1081 .sync_page = block_sync_page,
1085 static inline void test_and_set_uid(uid_t *p, uid_t value)
1091 static inline void test_and_set_gid(gid_t *p, gid_t value)
1097 static int isofs_read_level3_size(struct inode *inode)
1099 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1100 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1101 struct buffer_head *bh = NULL;
1102 unsigned long block, offset, block_saved, offset_saved;
1104 int more_entries = 0;
1105 struct iso_directory_record *tmpde = NULL;
1106 struct iso_inode_info *ei = ISOFS_I(inode);
1110 /* The first 16 blocks are reserved as the System Area. Thus,
1111 * no inodes can appear in block 0. We use this to flag that
1112 * this is the last section. */
1113 ei->i_next_section_block = 0;
1114 ei->i_next_section_offset = 0;
1116 block = ei->i_iget5_block;
1117 offset = ei->i_iget5_offset;
1120 struct iso_directory_record *de;
1121 unsigned int de_len;
1124 bh = sb_bread(inode->i_sb, block);
1128 de = (struct iso_directory_record *) (bh->b_data + offset);
1129 de_len = *(unsigned char *) de;
1139 block_saved = block;
1140 offset_saved = offset;
1143 /* Make sure we have a full directory entry */
1144 if (offset >= bufsize) {
1145 int slop = bufsize - offset + de_len;
1147 tmpde = kmalloc(256, GFP_KERNEL);
1151 memcpy(tmpde, de, slop);
1152 offset &= bufsize - 1;
1157 bh = sb_bread(inode->i_sb, block);
1160 memcpy((void *)tmpde+slop, bh->b_data, offset);
1165 inode->i_size += isonum_733(de->size);
1167 ei->i_next_section_block = block_saved;
1168 ei->i_next_section_offset = offset_saved;
1171 more_entries = de->flags[-high_sierra] & 0x80;
1176 } while (more_entries);
1189 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1194 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1195 "isofs_read_level3_size: inode=%lu\n",
1196 __func__, inode->i_ino);
1200 static int isofs_read_inode(struct inode *inode)
1202 struct super_block *sb = inode->i_sb;
1203 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1204 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1205 unsigned long block;
1206 int high_sierra = sbi->s_high_sierra;
1207 struct buffer_head *bh = NULL;
1208 struct iso_directory_record *de;
1209 struct iso_directory_record *tmpde = NULL;
1210 unsigned int de_len;
1211 unsigned long offset;
1212 struct iso_inode_info *ei = ISOFS_I(inode);
1215 block = ei->i_iget5_block;
1216 bh = sb_bread(inode->i_sb, block);
1220 offset = ei->i_iget5_offset;
1222 de = (struct iso_directory_record *) (bh->b_data + offset);
1223 de_len = *(unsigned char *) de;
1225 if (offset + de_len > bufsize) {
1226 int frag1 = bufsize - offset;
1228 tmpde = kmalloc(de_len, GFP_KERNEL);
1229 if (tmpde == NULL) {
1230 printk(KERN_INFO "%s: out of memory\n", __func__);
1234 memcpy(tmpde, bh->b_data + offset, frag1);
1236 bh = sb_bread(inode->i_sb, ++block);
1239 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1243 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1245 ISOFS_BUFFER_BITS(inode));
1247 /* Assume it is a normal-format file unless told otherwise */
1248 ei->i_file_format = isofs_file_normal;
1250 if (de->flags[-high_sierra] & 2) {
1251 inode->i_mode = S_IRUGO | S_IXUGO | S_IFDIR;
1252 inode->i_nlink = 1; /*
1253 * Set to 1. We know there are 2, but
1254 * the find utility tries to optimize
1255 * if it is 2, and it screws up. It is
1256 * easier to give 1 which tells find to
1257 * do it the hard way.
1260 /* Everybody gets to read the file. */
1261 inode->i_mode = sbi->s_mode;
1263 inode->i_mode |= S_IFREG;
1265 inode->i_uid = sbi->s_uid;
1266 inode->i_gid = sbi->s_gid;
1267 inode->i_blocks = 0;
1269 ei->i_format_parm[0] = 0;
1270 ei->i_format_parm[1] = 0;
1271 ei->i_format_parm[2] = 0;
1273 ei->i_section_size = isonum_733(de->size);
1274 if (de->flags[-high_sierra] & 0x80) {
1275 ret = isofs_read_level3_size(inode);
1280 ei->i_next_section_block = 0;
1281 ei->i_next_section_offset = 0;
1282 inode->i_size = isonum_733(de->size);
1286 * Some dipshit decided to store some other bit of information
1287 * in the high byte of the file length. Truncate size in case
1288 * this CDROM was mounted with the cruft option.
1291 if (sbi->s_cruft == 'y')
1292 inode->i_size &= 0x00ffffff;
1294 if (de->interleave[0]) {
1295 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
1299 /* I have no idea what file_unit_size is used for, so
1300 we will flag it for now */
1301 if (de->file_unit_size[0] != 0) {
1302 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1306 /* I have no idea what other flag bits are used for, so
1307 we will flag it for now */
1309 if((de->flags[-high_sierra] & ~2)!= 0){
1310 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1312 inode->i_ino, de->flags[-high_sierra]);
1316 inode->i_mtime.tv_sec =
1317 inode->i_atime.tv_sec =
1318 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1319 inode->i_mtime.tv_nsec =
1320 inode->i_atime.tv_nsec =
1321 inode->i_ctime.tv_nsec = 0;
1323 ei->i_first_extent = (isonum_733(de->extent) +
1324 isonum_711(de->ext_attr_length));
1326 /* Set the number of blocks for stat() - should be done before RR */
1327 inode->i_blocks = (inode->i_size + 511) >> 9;
1330 * Now test for possible Rock Ridge extensions which will override
1331 * some of these numbers in the inode structure.
1335 parse_rock_ridge_inode(de, inode);
1336 /* if we want uid/gid set, override the rock ridge setting */
1337 test_and_set_uid(&inode->i_uid, sbi->s_uid);
1338 test_and_set_gid(&inode->i_gid, sbi->s_gid);
1341 /* Install the inode operations vector */
1342 if (S_ISREG(inode->i_mode)) {
1343 inode->i_fop = &generic_ro_fops;
1344 switch (ei->i_file_format) {
1345 #ifdef CONFIG_ZISOFS
1346 case isofs_file_compressed:
1347 inode->i_data.a_ops = &zisofs_aops;
1351 inode->i_data.a_ops = &isofs_aops;
1354 } else if (S_ISDIR(inode->i_mode)) {
1355 inode->i_op = &isofs_dir_inode_operations;
1356 inode->i_fop = &isofs_dir_operations;
1357 } else if (S_ISLNK(inode->i_mode)) {
1358 inode->i_op = &page_symlink_inode_operations;
1359 inode->i_data.a_ops = &isofs_symlink_aops;
1361 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1362 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1372 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1377 struct isofs_iget5_callback_data {
1378 unsigned long block;
1379 unsigned long offset;
1382 static int isofs_iget5_test(struct inode *ino, void *data)
1384 struct iso_inode_info *i = ISOFS_I(ino);
1385 struct isofs_iget5_callback_data *d =
1386 (struct isofs_iget5_callback_data*)data;
1387 return (i->i_iget5_block == d->block)
1388 && (i->i_iget5_offset == d->offset);
1391 static int isofs_iget5_set(struct inode *ino, void *data)
1393 struct iso_inode_info *i = ISOFS_I(ino);
1394 struct isofs_iget5_callback_data *d =
1395 (struct isofs_iget5_callback_data*)data;
1396 i->i_iget5_block = d->block;
1397 i->i_iget5_offset = d->offset;
1401 /* Store, in the inode's containing structure, the block and block
1402 * offset that point to the underlying meta-data for the inode. The
1403 * code below is otherwise similar to the iget() code in
1404 * include/linux/fs.h */
1405 struct inode *isofs_iget(struct super_block *sb,
1406 unsigned long block,
1407 unsigned long offset)
1409 unsigned long hashval;
1410 struct inode *inode;
1411 struct isofs_iget5_callback_data data;
1414 if (offset >= 1ul << sb->s_blocksize_bits)
1415 return ERR_PTR(-EINVAL);
1418 data.offset = offset;
1420 hashval = (block << sb->s_blocksize_bits) | offset;
1422 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1423 &isofs_iget5_set, &data);
1426 return ERR_PTR(-ENOMEM);
1428 if (inode->i_state & I_NEW) {
1429 ret = isofs_read_inode(inode);
1432 inode = ERR_PTR(ret);
1434 unlock_new_inode(inode);
1441 static int isofs_get_sb(struct file_system_type *fs_type,
1442 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
1444 return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super,
1448 static struct file_system_type iso9660_fs_type = {
1449 .owner = THIS_MODULE,
1451 .get_sb = isofs_get_sb,
1452 .kill_sb = kill_block_super,
1453 .fs_flags = FS_REQUIRES_DEV,
1456 static int __init init_iso9660_fs(void)
1458 int err = init_inodecache();
1461 #ifdef CONFIG_ZISOFS
1462 err = zisofs_init();
1466 err = register_filesystem(&iso9660_fs_type);
1471 #ifdef CONFIG_ZISOFS
1475 destroy_inodecache();
1480 static void __exit exit_iso9660_fs(void)
1482 unregister_filesystem(&iso9660_fs_type);
1483 #ifdef CONFIG_ZISOFS
1486 destroy_inodecache();
1489 module_init(init_iso9660_fs)
1490 module_exit(exit_iso9660_fs)
1491 MODULE_LICENSE("GPL");
1492 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1493 MODULE_ALIAS("iso9660");