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 Moenkeberg - 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/config.h>
15 #include <linux/init.h>
16 #include <linux/module.h>
18 #include <linux/slab.h>
19 #include <linux/nls.h>
20 #include <linux/ctype.h>
21 #include <linux/smp_lock.h>
22 #include <linux/statfs.h>
23 #include <linux/cdrom.h>
24 #include <linux/parser.h>
31 static int isofs_hashi(struct dentry *parent, struct qstr *qstr);
32 static int isofs_hash(struct dentry *parent, struct qstr *qstr);
33 static int isofs_dentry_cmpi(struct dentry *dentry, struct qstr *a, struct qstr *b);
34 static int isofs_dentry_cmp(struct dentry *dentry, struct qstr *a, struct qstr *b);
37 static int isofs_hashi_ms(struct dentry *parent, struct qstr *qstr);
38 static int isofs_hash_ms(struct dentry *parent, struct qstr *qstr);
39 static int isofs_dentry_cmpi_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
40 static int isofs_dentry_cmp_ms(struct dentry *dentry, struct qstr *a, struct qstr *b);
43 static void isofs_put_super(struct super_block *sb)
45 struct isofs_sb_info *sbi = ISOFS_SB(sb);
47 if (sbi->s_nls_iocharset) {
48 unload_nls(sbi->s_nls_iocharset);
49 sbi->s_nls_iocharset = NULL;
58 static void isofs_read_inode(struct inode *);
59 static int isofs_statfs (struct super_block *, struct kstatfs *);
61 static kmem_cache_t *isofs_inode_cachep;
63 static struct inode *isofs_alloc_inode(struct super_block *sb)
65 struct iso_inode_info *ei;
66 ei = kmem_cache_alloc(isofs_inode_cachep, SLAB_KERNEL);
69 return &ei->vfs_inode;
72 static void isofs_destroy_inode(struct inode *inode)
74 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
77 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
79 struct iso_inode_info *ei = foo;
81 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
82 SLAB_CTOR_CONSTRUCTOR)
83 inode_init_once(&ei->vfs_inode);
86 static int init_inodecache(void)
88 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
89 sizeof(struct iso_inode_info),
90 0, SLAB_RECLAIM_ACCOUNT,
92 if (isofs_inode_cachep == NULL)
97 static void destroy_inodecache(void)
99 if (kmem_cache_destroy(isofs_inode_cachep))
100 printk(KERN_INFO "iso_inode_cache: not all structures were "
104 static int isofs_remount(struct super_block *sb, int *flags, char *data)
106 /* we probably want a lot more here */
111 static struct super_operations isofs_sops = {
112 .alloc_inode = isofs_alloc_inode,
113 .destroy_inode = isofs_destroy_inode,
114 .read_inode = isofs_read_inode,
115 .put_super = isofs_put_super,
116 .statfs = isofs_statfs,
117 .remount_fs = isofs_remount,
121 static struct dentry_operations isofs_dentry_ops[] = {
123 .d_hash = isofs_hash,
124 .d_compare = isofs_dentry_cmp,
127 .d_hash = isofs_hashi,
128 .d_compare = isofs_dentry_cmpi,
132 .d_hash = isofs_hash_ms,
133 .d_compare = isofs_dentry_cmp_ms,
136 .d_hash = isofs_hashi_ms,
137 .d_compare = isofs_dentry_cmpi_ms,
142 struct iso9660_options{
151 unsigned int blocksize;
163 * Compute the hash for the isofs name corresponding to the dentry.
166 isofs_hash_common(struct dentry *dentry, struct qstr *qstr, int ms)
174 while (len && name[len-1] == '.')
178 qstr->hash = full_name_hash(name, len);
184 * Compute the hash for the isofs name corresponding to the dentry.
187 isofs_hashi_common(struct dentry *dentry, struct qstr *qstr, int ms)
197 while (len && name[len-1] == '.')
201 hash = init_name_hash();
203 c = tolower(*name++);
204 hash = partial_name_hash(tolower(c), hash);
206 qstr->hash = end_name_hash(hash);
212 * Case insensitive compare of two isofs names.
214 static int isofs_dentry_cmpi_common(struct dentry *dentry, struct qstr *a,
215 struct qstr *b, int ms)
219 /* A filename cannot end in '.' or we treat it like it has none */
223 while (alen && a->name[alen-1] == '.')
225 while (blen && b->name[blen-1] == '.')
229 if (strnicmp(a->name, b->name, alen) == 0)
236 * Case sensitive compare of two isofs names.
238 static int isofs_dentry_cmp_common(struct dentry *dentry, struct qstr *a,
239 struct qstr *b, int ms)
243 /* A filename cannot end in '.' or we treat it like it has none */
247 while (alen && a->name[alen-1] == '.')
249 while (blen && b->name[blen-1] == '.')
253 if (strncmp(a->name, b->name, alen) == 0)
260 isofs_hash(struct dentry *dentry, struct qstr *qstr)
262 return isofs_hash_common(dentry, qstr, 0);
266 isofs_hashi(struct dentry *dentry, struct qstr *qstr)
268 return isofs_hashi_common(dentry, qstr, 0);
272 isofs_dentry_cmp(struct dentry *dentry,struct qstr *a,struct qstr *b)
274 return isofs_dentry_cmp_common(dentry, a, b, 0);
278 isofs_dentry_cmpi(struct dentry *dentry,struct qstr *a,struct qstr *b)
280 return isofs_dentry_cmpi_common(dentry, a, b, 0);
285 isofs_hash_ms(struct dentry *dentry, struct qstr *qstr)
287 return isofs_hash_common(dentry, qstr, 1);
291 isofs_hashi_ms(struct dentry *dentry, struct qstr *qstr)
293 return isofs_hashi_common(dentry, qstr, 1);
297 isofs_dentry_cmp_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
299 return isofs_dentry_cmp_common(dentry, a, b, 1);
303 isofs_dentry_cmpi_ms(struct dentry *dentry,struct qstr *a,struct qstr *b)
305 return isofs_dentry_cmpi_common(dentry, a, b, 1);
310 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
311 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
312 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
313 Opt_nocompress, Opt_hide, Opt_showassoc,
316 static match_table_t tokens = {
317 {Opt_norock, "norock"},
318 {Opt_nojoliet, "nojoliet"},
319 {Opt_unhide, "unhide"},
321 {Opt_showassoc, "showassoc"},
322 {Opt_cruft, "cruft"},
324 {Opt_iocharset, "iocharset=%s"},
325 {Opt_map_a, "map=acorn"},
326 {Opt_map_a, "map=a"},
327 {Opt_map_n, "map=normal"},
328 {Opt_map_n, "map=n"},
329 {Opt_map_o, "map=off"},
330 {Opt_map_o, "map=o"},
331 {Opt_session, "session=%u"},
332 {Opt_sb, "sbsector=%u"},
333 {Opt_check_r, "check=relaxed"},
334 {Opt_check_r, "check=r"},
335 {Opt_check_s, "check=strict"},
336 {Opt_check_s, "check=s"},
339 {Opt_mode, "mode=%u"},
340 {Opt_block, "block=%u"},
341 {Opt_ignore, "conv=binary"},
342 {Opt_ignore, "conv=b"},
343 {Opt_ignore, "conv=text"},
344 {Opt_ignore, "conv=t"},
345 {Opt_ignore, "conv=mtext"},
346 {Opt_ignore, "conv=m"},
347 {Opt_ignore, "conv=auto"},
348 {Opt_ignore, "conv=a"},
349 {Opt_nocompress, "nocompress"},
353 static int parse_options(char *options, struct iso9660_options *popt)
363 popt->showassoc = 'n';
364 popt->check = 'u'; /* unset */
365 popt->nocompress = 0;
366 popt->blocksize = 1024;
367 popt->mode = S_IRUGO | S_IXUGO; /* r-x for all. The disc could
368 be shared with DOS machines so
369 virtually anything could be
370 a valid executable. */
373 popt->iocharset = NULL;
380 while ((p = strsep(&options, ",")) != NULL) {
382 substring_t args[MAX_OPT_ARGS];
388 token = match_token(p, tokens, args);
401 popt->showassoc = 'y';
411 popt->iocharset = match_strdup(&args[0]);
424 if (match_int(&args[0], &option))
429 popt->session = n + 1;
432 if (match_int(&args[0], &option))
434 popt->sbsector = option;
445 if (match_int(&args[0], &option))
450 if (match_int(&args[0], &option))
455 if (match_int(&args[0], &option))
460 if (match_int(&args[0], &option))
463 if (n != 512 && n != 1024 && n != 2048)
468 popt->nocompress = 1;
478 * look if the driver can tell the multi session redirection value
480 * don't change this if you don't know what you do, please!
481 * Multisession is legal only with XA disks.
482 * A non-XA disk with more than one volume descriptor may do it right, but
483 * usually is written in a nowhere standardized "multi-partition" manner.
484 * Multisession uses absolute addressing (solely the first frame of the whole
485 * track is #0), multi-partition uses relative addressing (each first frame of
486 * each track is #0), and a track is not a session.
488 * A broken CDwriter software or drive firmware does not set new standards,
489 * at least not if conflicting with the existing ones.
493 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
495 static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
497 struct cdrom_multisession ms_info;
498 unsigned int vol_desc_start;
499 struct block_device *bdev = sb->s_bdev;
503 ms_info.addr_format=CDROM_LBA;
504 if(session >= 0 && session <= 99) {
505 struct cdrom_tocentry Te;
506 Te.cdte_track=session;
507 Te.cdte_format=CDROM_LBA;
508 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
510 printk(KERN_DEBUG "Session %d start %d type %d\n",
511 session, Te.cdte_addr.lba,
512 Te.cdte_ctrl&CDROM_DATA_TRACK);
513 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
514 return Te.cdte_addr.lba;
517 printk(KERN_ERR "Invalid session number or type of track\n");
519 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
521 printk(KERN_ERR "Invalid session number\n");
523 printk("isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
525 printk("isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
526 printk("isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
530 #if WE_OBEY_THE_WRITTEN_STANDARDS
531 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
533 vol_desc_start=ms_info.addr.lba;
534 return vol_desc_start;
538 * Initialize the superblock and read the root inode.
540 * Note: a check_disk_change() has been done immediately prior
541 * to this call, so we don't need to check again.
543 static int isofs_fill_super(struct super_block *s, void *data, int silent)
545 struct buffer_head * bh = NULL, *pri_bh = NULL;
546 struct hs_primary_descriptor * h_pri = NULL;
547 struct iso_primary_descriptor * pri = NULL;
548 struct iso_supplementary_descriptor *sec = NULL;
549 struct iso_directory_record * rootp;
550 int joliet_level = 0;
551 int iso_blknum, block;
554 unsigned int vol_desc_start;
555 unsigned long first_data_zone;
556 struct inode * inode;
557 struct iso9660_options opt;
558 struct isofs_sb_info * sbi;
560 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
564 memset(sbi, 0, sizeof(*sbi));
566 if (!parse_options((char *)data, &opt))
570 * First of all, get the hardware blocksize for this device.
571 * If we don't know what it is, or the hardware blocksize is
572 * larger than the blocksize the user specified, then use
576 * What if bugger tells us to go beyond page size?
578 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
580 sbi->s_high_sierra = 0; /* default is iso9660 */
582 vol_desc_start = (opt.sbsector != -1) ?
583 opt.sbsector : isofs_get_last_session(s,opt.session);
585 for (iso_blknum = vol_desc_start+16;
586 iso_blknum < vol_desc_start+100; iso_blknum++)
588 struct hs_volume_descriptor * hdp;
589 struct iso_volume_descriptor * vdp;
591 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
592 if (!(bh = sb_bread(s, block)))
595 vdp = (struct iso_volume_descriptor *)bh->b_data;
596 hdp = (struct hs_volume_descriptor *)bh->b_data;
598 /* Due to the overlapping physical location of the descriptors,
599 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
600 * proper identification in this case, we first check for ISO.
602 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
603 if (isonum_711 (vdp->type) == ISO_VD_END)
605 if (isonum_711 (vdp->type) == ISO_VD_PRIMARY) {
607 pri = (struct iso_primary_descriptor *)vdp;
608 /* Save the buffer in case we need it ... */
614 else if (isonum_711 (vdp->type) == ISO_VD_SUPPLEMENTARY) {
615 sec = (struct iso_supplementary_descriptor *)vdp;
616 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
617 if (opt.joliet == 'y') {
618 if (sec->escape[2] == 0x40) {
620 } else if (sec->escape[2] == 0x43) {
622 } else if (sec->escape[2] == 0x45) {
625 printk(KERN_DEBUG"ISO 9660 Extensions: Microsoft Joliet Level %d\n",
630 /* Unknown supplementary volume descriptor */
636 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
637 if (isonum_711 (hdp->type) != ISO_VD_PRIMARY)
640 sbi->s_high_sierra = 1;
642 h_pri = (struct hs_primary_descriptor *)vdp;
647 /* Just skip any volume descriptors we don't recognize */
653 * If we fall through, either no volume descriptor was found,
654 * or else we passed a primary descriptor looking for others.
657 goto out_unknown_format;
664 if (joliet_level && (pri == NULL || opt.rock == 'n')) {
665 /* This is the case of Joliet with the norock mount flag.
666 * A disc with both Joliet and Rock Ridge is handled later
668 pri = (struct iso_primary_descriptor *) sec;
671 if(sbi->s_high_sierra){
672 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
673 sbi->s_nzones = isonum_733 (h_pri->volume_space_size);
674 sbi->s_log_zone_size = isonum_723 (h_pri->logical_block_size);
675 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
679 rootp = (struct iso_directory_record *) pri->root_directory_record;
680 sbi->s_nzones = isonum_733 (pri->volume_space_size);
681 sbi->s_log_zone_size = isonum_723 (pri->logical_block_size);
682 sbi->s_max_size = isonum_733(pri->volume_space_size);
685 sbi->s_ninodes = 0; /* No way to figure this out easily */
687 orig_zonesize = sbi->s_log_zone_size;
689 * If the zone size is smaller than the hardware sector size,
690 * this is a fatal error. This would occur if the disc drive
691 * had sectors that were 2048 bytes, but the filesystem had
692 * blocks that were 512 bytes (which should only very rarely
695 if(orig_zonesize < opt.blocksize)
698 /* RDE: convert log zone size to bit shift */
699 switch (sbi->s_log_zone_size)
700 { case 512: sbi->s_log_zone_size = 9; break;
701 case 1024: sbi->s_log_zone_size = 10; break;
702 case 2048: sbi->s_log_zone_size = 11; break;
705 goto out_bad_zone_size;
708 s->s_magic = ISOFS_SUPER_MAGIC;
709 s->s_maxbytes = 0xffffffff; /* We can handle files up to 4 GB */
711 /* The CDROM is read-only, has no nodes (devices) on it, and since
712 all of the files appear to be owned by root, we really do not want
713 to allow suid. (suid or devices will not show up unless we have
714 Rock Ridge extensions) */
716 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
718 /* Set this for reference. Its not currently used except on write
719 which we don't have .. */
721 first_data_zone = isonum_733 (rootp->extent) +
722 isonum_711 (rootp->ext_attr_length);
723 sbi->s_firstdatazone = first_data_zone;
725 printk(KERN_DEBUG "Max size:%ld Log zone size:%ld\n",
727 1UL << sbi->s_log_zone_size);
728 printk(KERN_DEBUG "First datazone:%ld\n", sbi->s_firstdatazone);
729 if(sbi->s_high_sierra)
730 printk(KERN_DEBUG "Disc in High Sierra format.\n");
734 * If the Joliet level is set, we _may_ decide to use the
735 * secondary descriptor, but can't be sure until after we
736 * read the root inode. But before reading the root inode
737 * we may need to change the device blocksize, and would
738 * rather release the old buffer first. So, we cache the
739 * first_data_zone value from the secondary descriptor.
742 pri = (struct iso_primary_descriptor *) sec;
743 rootp = (struct iso_directory_record *)
744 pri->root_directory_record;
745 first_data_zone = isonum_733 (rootp->extent) +
746 isonum_711 (rootp->ext_attr_length);
750 * We're all done using the volume descriptor, and may need
751 * to change the device blocksize, so release the buffer now.
757 * Force the blocksize to 512 for 512 byte sectors. The file
758 * read primitives really get it wrong in a bad way if we don't
761 * Note - we should never be setting the blocksize to something
762 * less than the hardware sector size for the device. If we
763 * do, we would end up having to read larger buffers and split
764 * out portions to satisfy requests.
766 * Note2- the idea here is that we want to deal with the optimal
767 * zonesize in the filesystem. If we have it set to something less,
768 * then we have horrible problems with trying to piece together
769 * bits of adjacent blocks in order to properly read directory
770 * entries. By forcing the blocksize in this way, we ensure
771 * that we will never be required to do this.
773 sb_set_blocksize(s, orig_zonesize);
775 sbi->s_nls_iocharset = NULL;
778 if (joliet_level && opt.utf8 == 0) {
779 char * p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
780 sbi->s_nls_iocharset = load_nls(p);
781 if (! sbi->s_nls_iocharset) {
782 /* Fail only if explicit charset specified */
785 sbi->s_nls_iocharset = load_nls_default();
789 s->s_op = &isofs_sops;
790 s->s_export_op = &isofs_export_ops;
791 sbi->s_mapping = opt.map;
792 sbi->s_rock = (opt.rock == 'y' ? 2 : 0);
793 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
794 sbi->s_cruft = opt.cruft;
795 sbi->s_hide = opt.hide;
796 sbi->s_showassoc = opt.showassoc;
797 sbi->s_uid = opt.uid;
798 sbi->s_gid = opt.gid;
799 sbi->s_utf8 = opt.utf8;
800 sbi->s_nocompress = opt.nocompress;
802 * It would be incredibly stupid to allow people to mark every file
803 * on the disk as suid, so we merely allow them to set the default
806 sbi->s_mode = opt.mode & 0777;
809 * Read the root inode, which _may_ result in changing
810 * the s_rock flag. Once we have the final s_rock value,
811 * we then decide whether to use the Joliet descriptor.
813 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);
836 if (opt.check == 'u') {
837 /* Only Joliet is case insensitive by default */
838 if (joliet_level) opt.check = 'r';
839 else opt.check = 's';
841 sbi->s_joliet_level = joliet_level;
843 /* check the root inode */
848 /* get the root dentry */
849 s->s_root = d_alloc_root(inode);
854 if (joliet_level) table += 2;
855 if (opt.check == 'r') table++;
856 s->s_root->d_op = &isofs_dentry_ops[table];
858 kfree(opt.iocharset);
863 * Display error messages and free resources.
866 printk(KERN_WARNING "isofs_fill_super: root inode not initialized\n");
869 printk(KERN_WARNING "isofs_fill_super: get root inode failed\n");
873 if (sbi->s_nls_iocharset)
874 unload_nls(sbi->s_nls_iocharset);
878 printk(KERN_WARNING "isofs_fill_super: "
879 "bread failed, dev=%s, iso_blknum=%d, block=%d\n",
880 s->s_id, iso_blknum, block);
883 printk(KERN_WARNING "Bad logical zone size %ld\n",
884 sbi->s_log_zone_size);
887 printk(KERN_WARNING "Logical zone size(%d) < hardware blocksize(%u)\n",
888 orig_zonesize, opt.blocksize);
892 printk(KERN_WARNING "Unable to identify CD-ROM format.\n");
897 kfree(opt.iocharset);
903 static int isofs_statfs (struct super_block *sb, struct kstatfs *buf)
905 buf->f_type = ISOFS_SUPER_MAGIC;
906 buf->f_bsize = sb->s_blocksize;
907 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
908 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
911 buf->f_files = ISOFS_SB(sb)->s_ninodes;
913 buf->f_namelen = NAME_MAX;
918 * Get a set of blocks; filling in buffer_heads if already allocated
919 * or getblk() if they are not. Returns the number of blocks inserted
922 int isofs_get_blocks(struct inode *inode, sector_t iblock_s,
923 struct buffer_head **bh, unsigned long nblocks)
926 unsigned offset, sect_size;
927 unsigned int firstext;
928 unsigned long nextblk, nextoff;
929 long iblock = (long)iblock_s;
931 struct iso_inode_info *ei = ISOFS_I(inode);
936 if (iblock < 0 || iblock != iblock_s) {
937 printk("isofs_get_blocks: block number too large\n");
944 firstext = ei->i_first_extent;
945 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
946 nextblk = ei->i_next_section_block;
947 nextoff = ei->i_next_section_offset;
951 /* If we are *way* beyond the end of the file, print a message.
952 * Access beyond the end of the file up to the next page boundary
953 * is normal, however because of the way the page cache works.
954 * In this case, we just return 0 so that we can properly fill
955 * the page with useless information without generating any
958 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
959 printk("isofs_get_blocks: block >= EOF (%ld, %ld)\n",
960 iblock, (unsigned long) inode->i_size);
965 while (b_off >= (offset + sect_size)) {
966 struct inode *ninode;
971 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
974 firstext = ISOFS_I(ninode)->i_first_extent;
975 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
976 nextblk = ISOFS_I(ninode)->i_next_section_block;
977 nextoff = ISOFS_I(ninode)->i_next_section_offset;
980 if (++section > 100) {
981 printk("isofs_get_blocks: More than 100 file sections ?!?, aborting...\n");
982 printk("isofs_get_blocks: block=%ld firstext=%u sect_size=%u "
983 "nextblk=%lu nextoff=%lu\n",
984 iblock, firstext, (unsigned) sect_size,
992 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
994 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
998 bh++; /* Next buffer head */
999 b_off++; /* Next buffer offset */
1010 * Used by the standard interfaces.
1012 static int isofs_get_block(struct inode *inode, sector_t iblock,
1013 struct buffer_head *bh_result, int create)
1016 printk("isofs_get_block: Kernel tries to allocate a block\n");
1020 return isofs_get_blocks(inode, iblock, &bh_result, 1) ? 0 : -EIO;
1023 static int isofs_bmap(struct inode *inode, sector_t block)
1025 struct buffer_head dummy;
1029 dummy.b_blocknr = -1000;
1030 error = isofs_get_block(inode, block, &dummy, 0);
1032 return dummy.b_blocknr;
1036 struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1038 sector_t blknr = isofs_bmap(inode, block);
1041 return sb_bread(inode->i_sb, blknr);
1044 static int isofs_readpage(struct file *file, struct page *page)
1046 return block_read_full_page(page,isofs_get_block);
1049 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1051 return generic_block_bmap(mapping,block,isofs_get_block);
1054 static struct address_space_operations isofs_aops = {
1055 .readpage = isofs_readpage,
1056 .sync_page = block_sync_page,
1060 static inline void test_and_set_uid(uid_t *p, uid_t value)
1066 static inline void test_and_set_gid(gid_t *p, gid_t value)
1072 static int isofs_read_level3_size(struct inode *inode)
1074 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1075 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
1076 struct buffer_head * bh = NULL;
1077 unsigned long block, offset, block_saved, offset_saved;
1079 int more_entries = 0;
1080 struct iso_directory_record * tmpde = NULL;
1081 struct iso_inode_info *ei = ISOFS_I(inode);
1085 /* The first 16 blocks are reserved as the System Area. Thus,
1086 * no inodes can appear in block 0. We use this to flag that
1087 * this is the last section. */
1088 ei->i_next_section_block = 0;
1089 ei->i_next_section_offset = 0;
1091 block = ei->i_iget5_block;
1092 offset = ei->i_iget5_offset;
1095 struct iso_directory_record * de;
1096 unsigned int de_len;
1099 bh = sb_bread(inode->i_sb, block);
1103 de = (struct iso_directory_record *) (bh->b_data + offset);
1104 de_len = *(unsigned char *) de;
1114 block_saved = block;
1115 offset_saved = offset;
1118 /* Make sure we have a full directory entry */
1119 if (offset >= bufsize) {
1120 int slop = bufsize - offset + de_len;
1122 tmpde = kmalloc(256, GFP_KERNEL);
1126 memcpy(tmpde, de, slop);
1127 offset &= bufsize - 1;
1132 bh = sb_bread(inode->i_sb, block);
1135 memcpy((void *)tmpde+slop, bh->b_data, offset);
1140 inode->i_size += isonum_733(de->size);
1142 ei->i_next_section_block = block_saved;
1143 ei->i_next_section_offset = offset_saved;
1146 more_entries = de->flags[-high_sierra] & 0x80;
1151 } while (more_entries);
1164 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
1169 printk(KERN_INFO "isofs_read_level3_size: "
1170 "More than 100 file sections ?!?, aborting...\n"
1171 "isofs_read_level3_size: inode=%lu\n",
1176 static void isofs_read_inode(struct inode *inode)
1178 struct super_block *sb = inode->i_sb;
1179 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1180 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1181 unsigned long block;
1182 int high_sierra = sbi->s_high_sierra;
1183 struct buffer_head * bh = NULL;
1184 struct iso_directory_record * de;
1185 struct iso_directory_record * tmpde = NULL;
1186 unsigned int de_len;
1187 unsigned long offset;
1188 struct iso_inode_info *ei = ISOFS_I(inode);
1190 block = ei->i_iget5_block;
1191 bh = sb_bread(inode->i_sb, block);
1195 offset = ei->i_iget5_offset;
1197 de = (struct iso_directory_record *) (bh->b_data + offset);
1198 de_len = *(unsigned char *) de;
1200 if (offset + de_len > bufsize) {
1201 int frag1 = bufsize - offset;
1203 tmpde = kmalloc(de_len, GFP_KERNEL);
1204 if (tmpde == NULL) {
1205 printk(KERN_INFO "isofs_read_inode: out of memory\n");
1208 memcpy(tmpde, bh->b_data + offset, frag1);
1210 bh = sb_bread(inode->i_sb, ++block);
1213 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1217 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
1219 ISOFS_BUFFER_BITS(inode));
1221 /* Assume it is a normal-format file unless told otherwise */
1222 ei->i_file_format = isofs_file_normal;
1224 if (de->flags[-high_sierra] & 2) {
1225 inode->i_mode = S_IRUGO | S_IXUGO | S_IFDIR;
1226 inode->i_nlink = 1; /* Set to 1. We know there are 2, but
1227 the find utility tries to optimize
1228 if it is 2, and it screws up. It is
1229 easier to give 1 which tells find to
1230 do it the hard way. */
1232 /* Everybody gets to read the file. */
1233 inode->i_mode = sbi->s_mode;
1235 inode->i_mode |= S_IFREG;
1237 inode->i_uid = sbi->s_uid;
1238 inode->i_gid = sbi->s_gid;
1239 inode->i_blocks = inode->i_blksize = 0;
1241 ei->i_format_parm[0] = 0;
1242 ei->i_format_parm[1] = 0;
1243 ei->i_format_parm[2] = 0;
1245 ei->i_section_size = isonum_733 (de->size);
1246 if (de->flags[-high_sierra] & 0x80) {
1247 if(isofs_read_level3_size(inode)) goto fail;
1249 ei->i_next_section_block = 0;
1250 ei->i_next_section_offset = 0;
1251 inode->i_size = isonum_733 (de->size);
1255 * Some dipshit decided to store some other bit of information
1256 * in the high byte of the file length. Truncate size in case
1257 * this CDROM was mounted with the cruft option.
1260 if (sbi->s_cruft == 'y')
1261 inode->i_size &= 0x00ffffff;
1263 if (de->interleave[0]) {
1264 printk("Interleaved files not (yet) supported.\n");
1268 /* I have no idea what file_unit_size is used for, so
1269 we will flag it for now */
1270 if (de->file_unit_size[0] != 0) {
1271 printk("File unit size != 0 for ISO file (%ld).\n",
1275 /* I have no idea what other flag bits are used for, so
1276 we will flag it for now */
1278 if((de->flags[-high_sierra] & ~2)!= 0){
1279 printk("Unusual flag settings for ISO file (%ld %x).\n",
1280 inode->i_ino, de->flags[-high_sierra]);
1284 inode->i_mtime.tv_sec =
1285 inode->i_atime.tv_sec =
1286 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1287 inode->i_mtime.tv_nsec =
1288 inode->i_atime.tv_nsec =
1289 inode->i_ctime.tv_nsec = 0;
1291 ei->i_first_extent = (isonum_733 (de->extent) +
1292 isonum_711 (de->ext_attr_length));
1294 /* Set the number of blocks for stat() - should be done before RR */
1295 inode->i_blksize = PAGE_CACHE_SIZE; /* For stat() only */
1296 inode->i_blocks = (inode->i_size + 511) >> 9;
1299 * Now test for possible Rock Ridge extensions which will override
1300 * some of these numbers in the inode structure.
1304 parse_rock_ridge_inode(de, inode);
1305 /* if we want uid/gid set, override the rock ridge setting */
1306 test_and_set_uid(&inode->i_uid, sbi->s_uid);
1307 test_and_set_gid(&inode->i_gid, sbi->s_gid);
1310 /* Install the inode operations vector */
1311 if (S_ISREG(inode->i_mode)) {
1312 inode->i_fop = &generic_ro_fops;
1313 switch ( ei->i_file_format ) {
1314 #ifdef CONFIG_ZISOFS
1315 case isofs_file_compressed:
1316 inode->i_data.a_ops = &zisofs_aops;
1320 inode->i_data.a_ops = &isofs_aops;
1323 } else if (S_ISDIR(inode->i_mode)) {
1324 inode->i_op = &isofs_dir_inode_operations;
1325 inode->i_fop = &isofs_dir_operations;
1326 } else if (S_ISLNK(inode->i_mode)) {
1327 inode->i_op = &page_symlink_inode_operations;
1328 inode->i_data.a_ops = &isofs_symlink_aops;
1330 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1331 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1340 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
1342 make_bad_inode(inode);
1346 struct isofs_iget5_callback_data {
1347 unsigned long block;
1348 unsigned long offset;
1351 static int isofs_iget5_test(struct inode *ino, void *data)
1353 struct iso_inode_info *i = ISOFS_I(ino);
1354 struct isofs_iget5_callback_data *d =
1355 (struct isofs_iget5_callback_data*)data;
1356 return (i->i_iget5_block == d->block)
1357 && (i->i_iget5_offset == d->offset);
1360 static int isofs_iget5_set(struct inode *ino, void *data)
1362 struct iso_inode_info *i = ISOFS_I(ino);
1363 struct isofs_iget5_callback_data *d =
1364 (struct isofs_iget5_callback_data*)data;
1365 i->i_iget5_block = d->block;
1366 i->i_iget5_offset = d->offset;
1370 /* Store, in the inode's containing structure, the block and block
1371 * offset that point to the underlying meta-data for the inode. The
1372 * code below is otherwise similar to the iget() code in
1373 * include/linux/fs.h */
1374 struct inode *isofs_iget(struct super_block *sb,
1375 unsigned long block,
1376 unsigned long offset)
1378 unsigned long hashval;
1379 struct inode *inode;
1380 struct isofs_iget5_callback_data data;
1382 if (offset >= 1ul << sb->s_blocksize_bits)
1386 data.offset = offset;
1388 hashval = (block << sb->s_blocksize_bits) | offset;
1390 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
1391 &isofs_iget5_set, &data);
1393 if (inode && (inode->i_state & I_NEW)) {
1394 sb->s_op->read_inode(inode);
1395 unlock_new_inode(inode);
1401 static struct super_block *isofs_get_sb(struct file_system_type *fs_type,
1402 int flags, const char *dev_name, void *data)
1404 return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
1407 static struct file_system_type iso9660_fs_type = {
1408 .owner = THIS_MODULE,
1410 .get_sb = isofs_get_sb,
1411 .kill_sb = kill_block_super,
1412 .fs_flags = FS_REQUIRES_DEV,
1415 static int __init init_iso9660_fs(void)
1417 int err = init_inodecache();
1420 #ifdef CONFIG_ZISOFS
1421 err = zisofs_init();
1425 err = register_filesystem(&iso9660_fs_type);
1430 #ifdef CONFIG_ZISOFS
1434 destroy_inodecache();
1439 static void __exit exit_iso9660_fs(void)
1441 unregister_filesystem(&iso9660_fs_type);
1442 #ifdef CONFIG_ZISOFS
1445 destroy_inodecache();
1448 module_init(init_iso9660_fs)
1449 module_exit(exit_iso9660_fs)
1450 MODULE_LICENSE("GPL");
1451 /* Actual filesystem name is iso9660, as requested in filesystems.c */
1452 MODULE_ALIAS("iso9660");