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/cred.h>
19 #include <linux/nls.h>
20 #include <linux/ctype.h>
21 #include <linux/statfs.h>
22 #include <linux/cdrom.h>
23 #include <linux/parser.h>
24 #include <linux/mpage.h>
25 #include <linux/user_namespace.h>
26 #include <linux/seq_file.h>
33 static int isofs_hashi(const struct dentry
*parent
, struct qstr
*qstr
);
34 static int isofs_dentry_cmpi(const struct dentry
*dentry
,
35 unsigned int len
, const char *str
, const struct qstr
*name
);
38 static int isofs_hashi_ms(const struct dentry
*parent
, struct qstr
*qstr
);
39 static int isofs_hash_ms(const struct dentry
*parent
, struct qstr
*qstr
);
40 static int isofs_dentry_cmpi_ms(const struct dentry
*dentry
,
41 unsigned int len
, const char *str
, const struct qstr
*name
);
42 static int isofs_dentry_cmp_ms(const struct dentry
*dentry
,
43 unsigned int len
, const char *str
, const struct qstr
*name
);
46 static void isofs_put_super(struct super_block
*sb
)
48 struct isofs_sb_info
*sbi
= ISOFS_SB(sb
);
51 unload_nls(sbi
->s_nls_iocharset
);
59 static int isofs_read_inode(struct inode
*, int relocated
);
60 static int isofs_statfs (struct dentry
*, struct kstatfs
*);
61 static int isofs_show_options(struct seq_file
*, struct dentry
*);
63 static struct kmem_cache
*isofs_inode_cachep
;
65 static struct inode
*isofs_alloc_inode(struct super_block
*sb
)
67 struct iso_inode_info
*ei
;
68 ei
= kmem_cache_alloc(isofs_inode_cachep
, GFP_KERNEL
);
71 return &ei
->vfs_inode
;
74 static void isofs_i_callback(struct rcu_head
*head
)
76 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
77 kmem_cache_free(isofs_inode_cachep
, ISOFS_I(inode
));
80 static void isofs_destroy_inode(struct inode
*inode
)
82 call_rcu(&inode
->i_rcu
, isofs_i_callback
);
85 static void init_once(void *foo
)
87 struct iso_inode_info
*ei
= foo
;
89 inode_init_once(&ei
->vfs_inode
);
92 static int __init
init_inodecache(void)
94 isofs_inode_cachep
= kmem_cache_create("isofs_inode_cache",
95 sizeof(struct iso_inode_info
),
96 0, (SLAB_RECLAIM_ACCOUNT
|
97 SLAB_MEM_SPREAD
|SLAB_ACCOUNT
),
99 if (isofs_inode_cachep
== NULL
)
104 static void destroy_inodecache(void)
107 * Make sure all delayed rcu free inodes are flushed before we
111 kmem_cache_destroy(isofs_inode_cachep
);
114 static int isofs_remount(struct super_block
*sb
, int *flags
, char *data
)
117 if (!(*flags
& MS_RDONLY
))
122 static const struct super_operations isofs_sops
= {
123 .alloc_inode
= isofs_alloc_inode
,
124 .destroy_inode
= isofs_destroy_inode
,
125 .put_super
= isofs_put_super
,
126 .statfs
= isofs_statfs
,
127 .remount_fs
= isofs_remount
,
128 .show_options
= isofs_show_options
,
132 static const struct dentry_operations isofs_dentry_ops
[] = {
134 .d_hash
= isofs_hashi
,
135 .d_compare
= isofs_dentry_cmpi
,
139 .d_hash
= isofs_hash_ms
,
140 .d_compare
= isofs_dentry_cmp_ms
,
143 .d_hash
= isofs_hashi_ms
,
144 .d_compare
= isofs_dentry_cmpi_ms
,
149 struct iso9660_options
{
151 unsigned int joliet
:1;
152 unsigned int cruft
:1;
154 unsigned int showassoc
:1;
155 unsigned int nocompress
:1;
156 unsigned int overriderockperm
:1;
157 unsigned int uid_set
:1;
158 unsigned int gid_set
:1;
162 unsigned int blocksize
;
174 * Compute the hash for the isofs name corresponding to the dentry.
177 isofs_hashi_common(const struct dentry
*dentry
, struct qstr
*qstr
, int ms
)
187 while (len
&& name
[len
-1] == '.')
191 hash
= init_name_hash(dentry
);
193 c
= tolower(*name
++);
194 hash
= partial_name_hash(c
, hash
);
196 qstr
->hash
= end_name_hash(hash
);
202 * Compare of two isofs names.
204 static int isofs_dentry_cmp_common(
205 unsigned int len
, const char *str
,
206 const struct qstr
*name
, int ms
, int ci
)
210 /* A filename cannot end in '.' or we treat it like it has none */
214 while (alen
&& name
->name
[alen
-1] == '.')
216 while (blen
&& str
[blen
-1] == '.')
221 if (strncasecmp(name
->name
, str
, alen
) == 0)
224 if (strncmp(name
->name
, str
, alen
) == 0)
232 isofs_hashi(const struct dentry
*dentry
, struct qstr
*qstr
)
234 return isofs_hashi_common(dentry
, qstr
, 0);
238 isofs_dentry_cmpi(const struct dentry
*dentry
,
239 unsigned int len
, const char *str
, const struct qstr
*name
)
241 return isofs_dentry_cmp_common(len
, str
, name
, 0, 1);
246 * Compute the hash for the isofs name corresponding to the dentry.
249 isofs_hash_common(const struct dentry
*dentry
, struct qstr
*qstr
, int ms
)
257 while (len
&& name
[len
-1] == '.')
261 qstr
->hash
= full_name_hash(dentry
, name
, len
);
267 isofs_hash_ms(const struct dentry
*dentry
, struct qstr
*qstr
)
269 return isofs_hash_common(dentry
, qstr
, 1);
273 isofs_hashi_ms(const struct dentry
*dentry
, struct qstr
*qstr
)
275 return isofs_hashi_common(dentry
, qstr
, 1);
279 isofs_dentry_cmp_ms(const struct dentry
*dentry
,
280 unsigned int len
, const char *str
, const struct qstr
*name
)
282 return isofs_dentry_cmp_common(len
, str
, name
, 1, 0);
286 isofs_dentry_cmpi_ms(const struct dentry
*dentry
,
287 unsigned int len
, const char *str
, const struct qstr
*name
)
289 return isofs_dentry_cmp_common(len
, str
, name
, 1, 1);
294 Opt_block
, Opt_check_r
, Opt_check_s
, Opt_cruft
, Opt_gid
, Opt_ignore
,
295 Opt_iocharset
, Opt_map_a
, Opt_map_n
, Opt_map_o
, Opt_mode
, Opt_nojoliet
,
296 Opt_norock
, Opt_sb
, Opt_session
, Opt_uid
, Opt_unhide
, Opt_utf8
, Opt_err
,
297 Opt_nocompress
, Opt_hide
, Opt_showassoc
, Opt_dmode
, Opt_overriderockperm
,
300 static const match_table_t tokens
= {
301 {Opt_norock
, "norock"},
302 {Opt_nojoliet
, "nojoliet"},
303 {Opt_unhide
, "unhide"},
305 {Opt_showassoc
, "showassoc"},
306 {Opt_cruft
, "cruft"},
308 {Opt_iocharset
, "iocharset=%s"},
309 {Opt_map_a
, "map=acorn"},
310 {Opt_map_a
, "map=a"},
311 {Opt_map_n
, "map=normal"},
312 {Opt_map_n
, "map=n"},
313 {Opt_map_o
, "map=off"},
314 {Opt_map_o
, "map=o"},
315 {Opt_session
, "session=%u"},
316 {Opt_sb
, "sbsector=%u"},
317 {Opt_check_r
, "check=relaxed"},
318 {Opt_check_r
, "check=r"},
319 {Opt_check_s
, "check=strict"},
320 {Opt_check_s
, "check=s"},
323 {Opt_mode
, "mode=%u"},
324 {Opt_dmode
, "dmode=%u"},
325 {Opt_overriderockperm
, "overriderockperm"},
326 {Opt_block
, "block=%u"},
327 {Opt_ignore
, "conv=binary"},
328 {Opt_ignore
, "conv=b"},
329 {Opt_ignore
, "conv=text"},
330 {Opt_ignore
, "conv=t"},
331 {Opt_ignore
, "conv=mtext"},
332 {Opt_ignore
, "conv=m"},
333 {Opt_ignore
, "conv=auto"},
334 {Opt_ignore
, "conv=a"},
335 {Opt_nocompress
, "nocompress"},
339 static int parse_options(char *options
, struct iso9660_options
*popt
)
350 popt
->check
= 'u'; /* unset */
351 popt
->nocompress
= 0;
352 popt
->blocksize
= 1024;
353 popt
->fmode
= popt
->dmode
= ISOFS_INVALID_MODE
;
356 popt
->gid
= GLOBAL_ROOT_GID
;
357 popt
->uid
= GLOBAL_ROOT_UID
;
358 popt
->iocharset
= NULL
;
360 popt
->overriderockperm
= 0;
366 while ((p
= strsep(&options
, ",")) != NULL
) {
368 substring_t args
[MAX_OPT_ARGS
];
374 token
= match_token(p
, tokens
, args
);
397 popt
->iocharset
= match_strdup(&args
[0]);
410 if (match_int(&args
[0], &option
))
415 popt
->session
= n
+ 1;
418 if (match_int(&args
[0], &option
))
420 popt
->sbsector
= option
;
431 if (match_int(&args
[0], &option
))
433 popt
->uid
= make_kuid(current_user_ns(), option
);
434 if (!uid_valid(popt
->uid
))
439 if (match_int(&args
[0], &option
))
441 popt
->gid
= make_kgid(current_user_ns(), option
);
442 if (!gid_valid(popt
->gid
))
447 if (match_int(&args
[0], &option
))
449 popt
->fmode
= option
;
452 if (match_int(&args
[0], &option
))
454 popt
->dmode
= option
;
456 case Opt_overriderockperm
:
457 popt
->overriderockperm
= 1;
460 if (match_int(&args
[0], &option
))
463 if (n
!= 512 && n
!= 1024 && n
!= 2048)
468 popt
->nocompress
= 1;
478 * Display the mount options in /proc/mounts.
480 static int isofs_show_options(struct seq_file
*m
, struct dentry
*root
)
482 struct isofs_sb_info
*sbi
= ISOFS_SB(root
->d_sb
);
484 if (!sbi
->s_rock
) seq_puts(m
, ",norock");
485 else if (!sbi
->s_joliet_level
) seq_puts(m
, ",nojoliet");
486 if (sbi
->s_cruft
) seq_puts(m
, ",cruft");
487 if (sbi
->s_hide
) seq_puts(m
, ",hide");
488 if (sbi
->s_nocompress
) seq_puts(m
, ",nocompress");
489 if (sbi
->s_overriderockperm
) seq_puts(m
, ",overriderockperm");
490 if (sbi
->s_showassoc
) seq_puts(m
, ",showassoc");
491 if (sbi
->s_utf8
) seq_puts(m
, ",utf8");
493 if (sbi
->s_check
) seq_printf(m
, ",check=%c", sbi
->s_check
);
494 if (sbi
->s_mapping
) seq_printf(m
, ",map=%c", sbi
->s_mapping
);
495 if (sbi
->s_session
!= 255) seq_printf(m
, ",session=%u", sbi
->s_session
- 1);
496 if (sbi
->s_sbsector
!= -1) seq_printf(m
, ",sbsector=%u", sbi
->s_sbsector
);
498 if (root
->d_sb
->s_blocksize
!= 1024)
499 seq_printf(m
, ",blocksize=%lu", root
->d_sb
->s_blocksize
);
502 seq_printf(m
, ",uid=%u",
503 from_kuid_munged(&init_user_ns
, sbi
->s_uid
));
505 seq_printf(m
, ",gid=%u",
506 from_kgid_munged(&init_user_ns
, sbi
->s_gid
));
508 if (sbi
->s_dmode
!= ISOFS_INVALID_MODE
)
509 seq_printf(m
, ",dmode=%o", sbi
->s_dmode
);
510 if (sbi
->s_fmode
!= ISOFS_INVALID_MODE
)
511 seq_printf(m
, ",fmode=%o", sbi
->s_fmode
);
513 if (sbi
->s_nls_iocharset
&&
514 strcmp(sbi
->s_nls_iocharset
->charset
, CONFIG_NLS_DEFAULT
) != 0)
515 seq_printf(m
, ",iocharset=%s", sbi
->s_nls_iocharset
->charset
);
520 * look if the driver can tell the multi session redirection value
522 * don't change this if you don't know what you do, please!
523 * Multisession is legal only with XA disks.
524 * A non-XA disk with more than one volume descriptor may do it right, but
525 * usually is written in a nowhere standardized "multi-partition" manner.
526 * Multisession uses absolute addressing (solely the first frame of the whole
527 * track is #0), multi-partition uses relative addressing (each first frame of
528 * each track is #0), and a track is not a session.
530 * A broken CDwriter software or drive firmware does not set new standards,
531 * at least not if conflicting with the existing ones.
535 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
537 static unsigned int isofs_get_last_session(struct super_block
*sb
, s32 session
)
539 struct cdrom_multisession ms_info
;
540 unsigned int vol_desc_start
;
541 struct block_device
*bdev
= sb
->s_bdev
;
545 ms_info
.addr_format
=CDROM_LBA
;
546 if(session
>= 0 && session
<= 99) {
547 struct cdrom_tocentry Te
;
548 Te
.cdte_track
=session
;
549 Te
.cdte_format
=CDROM_LBA
;
550 i
= ioctl_by_bdev(bdev
, CDROMREADTOCENTRY
, (unsigned long) &Te
);
552 printk(KERN_DEBUG
"ISOFS: Session %d start %d type %d\n",
553 session
, Te
.cdte_addr
.lba
,
554 Te
.cdte_ctrl
&CDROM_DATA_TRACK
);
555 if ((Te
.cdte_ctrl
&CDROM_DATA_TRACK
) == 4)
556 return Te
.cdte_addr
.lba
;
559 printk(KERN_ERR
"ISOFS: Invalid session number or type of track\n");
561 i
= ioctl_by_bdev(bdev
, CDROMMULTISESSION
, (unsigned long) &ms_info
);
563 printk(KERN_ERR
"ISOFS: Invalid session number\n");
565 printk(KERN_DEBUG
"isofs.inode: CDROMMULTISESSION: rc=%d\n",i
);
567 printk(KERN_DEBUG
"isofs.inode: XA disk: %s\n",ms_info
.xa_flag
?"yes":"no");
568 printk(KERN_DEBUG
"isofs.inode: vol_desc_start = %d\n", ms_info
.addr
.lba
);
572 #if WE_OBEY_THE_WRITTEN_STANDARDS
573 if (ms_info
.xa_flag
) /* necessary for a valid ms_info.addr */
575 vol_desc_start
=ms_info
.addr
.lba
;
576 return vol_desc_start
;
580 * Check if root directory is empty (has less than 3 files).
582 * Used to detect broken CDs where ISO root directory is empty but Joliet root
583 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
584 * (and Joliet used instead) or else no files would be visible.
586 static bool rootdir_empty(struct super_block
*sb
, unsigned long block
)
588 int offset
= 0, files
= 0, de_len
;
589 struct iso_directory_record
*de
;
590 struct buffer_head
*bh
;
592 bh
= sb_bread(sb
, block
);
596 de
= (struct iso_directory_record
*) (bh
->b_data
+ offset
);
597 de_len
= *(unsigned char *) de
;
608 * Initialize the superblock and read the root inode.
610 * Note: a check_disk_change() has been done immediately prior
611 * to this call, so we don't need to check again.
613 static int isofs_fill_super(struct super_block
*s
, void *data
, int silent
)
615 struct buffer_head
*bh
= NULL
, *pri_bh
= NULL
;
616 struct hs_primary_descriptor
*h_pri
= NULL
;
617 struct iso_primary_descriptor
*pri
= NULL
;
618 struct iso_supplementary_descriptor
*sec
= NULL
;
619 struct iso_directory_record
*rootp
;
621 struct iso9660_options opt
;
622 struct isofs_sb_info
*sbi
;
623 unsigned long first_data_zone
;
624 int joliet_level
= 0;
625 int iso_blknum
, block
;
627 int table
, error
= -EINVAL
;
628 unsigned int vol_desc_start
;
630 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
635 if (!parse_options((char *)data
, &opt
))
639 * First of all, get the hardware blocksize for this device.
640 * If we don't know what it is, or the hardware blocksize is
641 * larger than the blocksize the user specified, then use
645 * What if bugger tells us to go beyond page size?
647 opt
.blocksize
= sb_min_blocksize(s
, opt
.blocksize
);
649 sbi
->s_high_sierra
= 0; /* default is iso9660 */
650 sbi
->s_session
= opt
.session
;
651 sbi
->s_sbsector
= opt
.sbsector
;
653 vol_desc_start
= (opt
.sbsector
!= -1) ?
654 opt
.sbsector
: isofs_get_last_session(s
,opt
.session
);
656 for (iso_blknum
= vol_desc_start
+16;
657 iso_blknum
< vol_desc_start
+100; iso_blknum
++) {
658 struct hs_volume_descriptor
*hdp
;
659 struct iso_volume_descriptor
*vdp
;
661 block
= iso_blknum
<< (ISOFS_BLOCK_BITS
- s
->s_blocksize_bits
);
662 if (!(bh
= sb_bread(s
, block
)))
665 vdp
= (struct iso_volume_descriptor
*)bh
->b_data
;
666 hdp
= (struct hs_volume_descriptor
*)bh
->b_data
;
669 * Due to the overlapping physical location of the descriptors,
670 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
671 * proper identification in this case, we first check for ISO.
673 if (strncmp (vdp
->id
, ISO_STANDARD_ID
, sizeof vdp
->id
) == 0) {
674 if (isonum_711(vdp
->type
) == ISO_VD_END
)
676 if (isonum_711(vdp
->type
) == ISO_VD_PRIMARY
) {
678 pri
= (struct iso_primary_descriptor
*)vdp
;
679 /* Save the buffer in case we need it ... */
685 else if (isonum_711(vdp
->type
) == ISO_VD_SUPPLEMENTARY
) {
686 sec
= (struct iso_supplementary_descriptor
*)vdp
;
687 if (sec
->escape
[0] == 0x25 && sec
->escape
[1] == 0x2f) {
689 if (sec
->escape
[2] == 0x40)
691 else if (sec
->escape
[2] == 0x43)
693 else if (sec
->escape
[2] == 0x45)
696 printk(KERN_DEBUG
"ISO 9660 Extensions: "
697 "Microsoft Joliet Level %d\n",
702 /* Unknown supplementary volume descriptor */
708 if (strncmp (hdp
->id
, HS_STANDARD_ID
, sizeof hdp
->id
) == 0) {
709 if (isonum_711(hdp
->type
) != ISO_VD_PRIMARY
)
712 sbi
->s_high_sierra
= 1;
714 h_pri
= (struct hs_primary_descriptor
*)vdp
;
719 /* Just skip any volume descriptors we don't recognize */
725 * If we fall through, either no volume descriptor was found,
726 * or else we passed a primary descriptor looking for others.
729 goto out_unknown_format
;
735 /* We don't support read-write mounts */
736 if (!(s
->s_flags
& MS_RDONLY
)) {
741 if (joliet_level
&& (pri
== NULL
|| !opt
.rock
)) {
742 /* This is the case of Joliet with the norock mount flag.
743 * A disc with both Joliet and Rock Ridge is handled later
745 pri
= (struct iso_primary_descriptor
*) sec
;
748 if(sbi
->s_high_sierra
){
749 rootp
= (struct iso_directory_record
*) h_pri
->root_directory_record
;
750 sbi
->s_nzones
= isonum_733(h_pri
->volume_space_size
);
751 sbi
->s_log_zone_size
= isonum_723(h_pri
->logical_block_size
);
752 sbi
->s_max_size
= isonum_733(h_pri
->volume_space_size
);
756 rootp
= (struct iso_directory_record
*) pri
->root_directory_record
;
757 sbi
->s_nzones
= isonum_733(pri
->volume_space_size
);
758 sbi
->s_log_zone_size
= isonum_723(pri
->logical_block_size
);
759 sbi
->s_max_size
= isonum_733(pri
->volume_space_size
);
762 sbi
->s_ninodes
= 0; /* No way to figure this out easily */
764 orig_zonesize
= sbi
->s_log_zone_size
;
766 * If the zone size is smaller than the hardware sector size,
767 * this is a fatal error. This would occur if the disc drive
768 * had sectors that were 2048 bytes, but the filesystem had
769 * blocks that were 512 bytes (which should only very rarely
772 if (orig_zonesize
< opt
.blocksize
)
775 /* RDE: convert log zone size to bit shift */
776 switch (sbi
->s_log_zone_size
) {
777 case 512: sbi
->s_log_zone_size
= 9; break;
778 case 1024: sbi
->s_log_zone_size
= 10; break;
779 case 2048: sbi
->s_log_zone_size
= 11; break;
782 goto out_bad_zone_size
;
785 s
->s_magic
= ISOFS_SUPER_MAGIC
;
788 * With multi-extent files, file size is only limited by the maximum
789 * size of a file system, which is 8 TB.
791 s
->s_maxbytes
= 0x80000000000LL
;
793 /* Set this for reference. Its not currently used except on write
794 which we don't have .. */
796 first_data_zone
= isonum_733(rootp
->extent
) +
797 isonum_711(rootp
->ext_attr_length
);
798 sbi
->s_firstdatazone
= first_data_zone
;
800 printk(KERN_DEBUG
"ISOFS: Max size:%ld Log zone size:%ld\n",
801 sbi
->s_max_size
, 1UL << sbi
->s_log_zone_size
);
802 printk(KERN_DEBUG
"ISOFS: First datazone:%ld\n", sbi
->s_firstdatazone
);
803 if(sbi
->s_high_sierra
)
804 printk(KERN_DEBUG
"ISOFS: Disc in High Sierra format.\n");
808 * If the Joliet level is set, we _may_ decide to use the
809 * secondary descriptor, but can't be sure until after we
810 * read the root inode. But before reading the root inode
811 * we may need to change the device blocksize, and would
812 * rather release the old buffer first. So, we cache the
813 * first_data_zone value from the secondary descriptor.
816 pri
= (struct iso_primary_descriptor
*) sec
;
817 rootp
= (struct iso_directory_record
*)
818 pri
->root_directory_record
;
819 first_data_zone
= isonum_733(rootp
->extent
) +
820 isonum_711(rootp
->ext_attr_length
);
824 * We're all done using the volume descriptor, and may need
825 * to change the device blocksize, so release the buffer now.
831 * Force the blocksize to 512 for 512 byte sectors. The file
832 * read primitives really get it wrong in a bad way if we don't
835 * Note - we should never be setting the blocksize to something
836 * less than the hardware sector size for the device. If we
837 * do, we would end up having to read larger buffers and split
838 * out portions to satisfy requests.
840 * Note2- the idea here is that we want to deal with the optimal
841 * zonesize in the filesystem. If we have it set to something less,
842 * then we have horrible problems with trying to piece together
843 * bits of adjacent blocks in order to properly read directory
844 * entries. By forcing the blocksize in this way, we ensure
845 * that we will never be required to do this.
847 sb_set_blocksize(s
, orig_zonesize
);
849 sbi
->s_nls_iocharset
= NULL
;
852 if (joliet_level
&& opt
.utf8
== 0) {
853 char *p
= opt
.iocharset
? opt
.iocharset
: CONFIG_NLS_DEFAULT
;
854 sbi
->s_nls_iocharset
= load_nls(p
);
855 if (! sbi
->s_nls_iocharset
) {
856 /* Fail only if explicit charset specified */
859 sbi
->s_nls_iocharset
= load_nls_default();
863 s
->s_op
= &isofs_sops
;
864 s
->s_export_op
= &isofs_export_ops
;
865 sbi
->s_mapping
= opt
.map
;
866 sbi
->s_rock
= (opt
.rock
? 2 : 0);
867 sbi
->s_rock_offset
= -1; /* initial offset, will guess until SP is found*/
868 sbi
->s_cruft
= opt
.cruft
;
869 sbi
->s_hide
= opt
.hide
;
870 sbi
->s_showassoc
= opt
.showassoc
;
871 sbi
->s_uid
= opt
.uid
;
872 sbi
->s_gid
= opt
.gid
;
873 sbi
->s_uid_set
= opt
.uid_set
;
874 sbi
->s_gid_set
= opt
.gid_set
;
875 sbi
->s_utf8
= opt
.utf8
;
876 sbi
->s_nocompress
= opt
.nocompress
;
877 sbi
->s_overriderockperm
= opt
.overriderockperm
;
879 * It would be incredibly stupid to allow people to mark every file
880 * on the disk as suid, so we merely allow them to set the default
883 if (opt
.fmode
!= ISOFS_INVALID_MODE
)
884 sbi
->s_fmode
= opt
.fmode
& 0777;
886 sbi
->s_fmode
= ISOFS_INVALID_MODE
;
887 if (opt
.dmode
!= ISOFS_INVALID_MODE
)
888 sbi
->s_dmode
= opt
.dmode
& 0777;
890 sbi
->s_dmode
= ISOFS_INVALID_MODE
;
893 * Read the root inode, which _may_ result in changing
894 * the s_rock flag. Once we have the final s_rock value,
895 * we then decide whether to use the Joliet descriptor.
897 inode
= isofs_iget(s
, sbi
->s_firstdatazone
, 0);
902 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
903 * correct Joliet root directory.
905 if (sbi
->s_rock
== 1 && joliet_level
&&
906 rootdir_empty(s
, sbi
->s_firstdatazone
)) {
908 "ISOFS: primary root directory is empty. "
909 "Disabling Rock Ridge and switching to Joliet.");
914 * If this disk has both Rock Ridge and Joliet on it, then we
915 * want to use Rock Ridge by default. This can be overridden
916 * by using the norock mount option. There is still one other
917 * possibility that is not taken into account: a Rock Ridge
918 * CD with Unicode names. Until someone sees such a beast, it
919 * will not be supported.
921 if (sbi
->s_rock
== 1) {
923 } else if (joliet_level
) {
925 if (sbi
->s_firstdatazone
!= first_data_zone
) {
926 sbi
->s_firstdatazone
= first_data_zone
;
928 "ISOFS: changing to secondary root\n");
930 inode
= isofs_iget(s
, sbi
->s_firstdatazone
, 0);
936 if (opt
.check
== 'u') {
937 /* Only Joliet is case insensitive by default */
943 sbi
->s_joliet_level
= joliet_level
;
945 /* Make sure the root inode is a directory */
946 if (!S_ISDIR(inode
->i_mode
)) {
948 "isofs_fill_super: root inode is not a directory. "
949 "Corrupted media?\n");
956 if (opt
.check
== 'r')
958 sbi
->s_check
= opt
.check
;
961 s
->s_d_op
= &isofs_dentry_ops
[table
- 1];
963 /* get the root dentry */
964 s
->s_root
= d_make_root(inode
);
970 kfree(opt
.iocharset
);
975 * Display error messages and free resources.
981 error
= PTR_ERR(inode
);
982 if (error
!= -ENOMEM
)
983 printk(KERN_WARNING
"%s: get root inode failed\n", __func__
);
986 unload_nls(sbi
->s_nls_iocharset
);
990 printk(KERN_WARNING
"%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
991 __func__
, s
->s_id
, iso_blknum
, block
);
994 printk(KERN_WARNING
"ISOFS: Bad logical zone size %ld\n",
995 sbi
->s_log_zone_size
);
998 printk(KERN_WARNING
"ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
999 orig_zonesize
, opt
.blocksize
);
1003 printk(KERN_WARNING
"ISOFS: Unable to identify CD-ROM format.\n");
1009 kfree(opt
.iocharset
);
1011 s
->s_fs_info
= NULL
;
1015 static int isofs_statfs (struct dentry
*dentry
, struct kstatfs
*buf
)
1017 struct super_block
*sb
= dentry
->d_sb
;
1018 u64 id
= huge_encode_dev(sb
->s_bdev
->bd_dev
);
1020 buf
->f_type
= ISOFS_SUPER_MAGIC
;
1021 buf
->f_bsize
= sb
->s_blocksize
;
1022 buf
->f_blocks
= (ISOFS_SB(sb
)->s_nzones
1023 << (ISOFS_SB(sb
)->s_log_zone_size
- sb
->s_blocksize_bits
));
1026 buf
->f_files
= ISOFS_SB(sb
)->s_ninodes
;
1028 buf
->f_fsid
.val
[0] = (u32
)id
;
1029 buf
->f_fsid
.val
[1] = (u32
)(id
>> 32);
1030 buf
->f_namelen
= NAME_MAX
;
1035 * Get a set of blocks; filling in buffer_heads if already allocated
1036 * or getblk() if they are not. Returns the number of blocks inserted
1039 int isofs_get_blocks(struct inode
*inode
, sector_t iblock
,
1040 struct buffer_head
**bh
, unsigned long nblocks
)
1042 unsigned long b_off
= iblock
;
1043 unsigned offset
, sect_size
;
1044 unsigned int firstext
;
1045 unsigned long nextblk
, nextoff
;
1046 int section
, rv
, error
;
1047 struct iso_inode_info
*ei
= ISOFS_I(inode
);
1051 if (iblock
!= b_off
) {
1052 printk(KERN_DEBUG
"%s: block number too large\n", __func__
);
1058 firstext
= ei
->i_first_extent
;
1059 sect_size
= ei
->i_section_size
>> ISOFS_BUFFER_BITS(inode
);
1060 nextblk
= ei
->i_next_section_block
;
1061 nextoff
= ei
->i_next_section_offset
;
1065 /* If we are *way* beyond the end of the file, print a message.
1066 * Access beyond the end of the file up to the next page boundary
1067 * is normal, however because of the way the page cache works.
1068 * In this case, we just return 0 so that we can properly fill
1069 * the page with useless information without generating any
1072 if (b_off
> ((inode
->i_size
+ PAGE_SIZE
- 1) >> ISOFS_BUFFER_BITS(inode
))) {
1073 printk(KERN_DEBUG
"%s: block >= EOF (%lu, %llu)\n",
1075 (unsigned long long)inode
->i_size
);
1079 /* On the last section, nextblk == 0, section size is likely to
1080 * exceed sect_size by a partial block, and access beyond the
1081 * end of the file will reach beyond the section size, too.
1083 while (nextblk
&& (b_off
>= (offset
+ sect_size
))) {
1084 struct inode
*ninode
;
1086 offset
+= sect_size
;
1087 ninode
= isofs_iget(inode
->i_sb
, nextblk
, nextoff
);
1088 if (IS_ERR(ninode
)) {
1089 error
= PTR_ERR(ninode
);
1092 firstext
= ISOFS_I(ninode
)->i_first_extent
;
1093 sect_size
= ISOFS_I(ninode
)->i_section_size
>> ISOFS_BUFFER_BITS(ninode
);
1094 nextblk
= ISOFS_I(ninode
)->i_next_section_block
;
1095 nextoff
= ISOFS_I(ninode
)->i_next_section_offset
;
1098 if (++section
> 100) {
1099 printk(KERN_DEBUG
"%s: More than 100 file sections ?!?"
1100 " aborting...\n", __func__
);
1101 printk(KERN_DEBUG
"%s: block=%lu firstext=%u sect_size=%u "
1102 "nextblk=%lu nextoff=%lu\n", __func__
,
1103 b_off
, firstext
, (unsigned) sect_size
,
1110 map_bh(*bh
, inode
->i_sb
, firstext
+ b_off
- offset
);
1112 *bh
= sb_getblk(inode
->i_sb
, firstext
+b_off
-offset
);
1116 bh
++; /* Next buffer head */
1117 b_off
++; /* Next buffer offset */
1124 return rv
!= 0 ? rv
: error
;
1128 * Used by the standard interfaces.
1130 static int isofs_get_block(struct inode
*inode
, sector_t iblock
,
1131 struct buffer_head
*bh_result
, int create
)
1136 printk(KERN_DEBUG
"%s: Kernel tries to allocate a block\n", __func__
);
1140 ret
= isofs_get_blocks(inode
, iblock
, &bh_result
, 1);
1141 return ret
< 0 ? ret
: 0;
1144 static int isofs_bmap(struct inode
*inode
, sector_t block
)
1146 struct buffer_head dummy
;
1150 dummy
.b_blocknr
= -1000;
1151 error
= isofs_get_block(inode
, block
, &dummy
, 0);
1153 return dummy
.b_blocknr
;
1157 struct buffer_head
*isofs_bread(struct inode
*inode
, sector_t block
)
1159 sector_t blknr
= isofs_bmap(inode
, block
);
1162 return sb_bread(inode
->i_sb
, blknr
);
1165 static int isofs_readpage(struct file
*file
, struct page
*page
)
1167 return mpage_readpage(page
, isofs_get_block
);
1170 static int isofs_readpages(struct file
*file
, struct address_space
*mapping
,
1171 struct list_head
*pages
, unsigned nr_pages
)
1173 return mpage_readpages(mapping
, pages
, nr_pages
, isofs_get_block
);
1176 static sector_t
_isofs_bmap(struct address_space
*mapping
, sector_t block
)
1178 return generic_block_bmap(mapping
,block
,isofs_get_block
);
1181 static const struct address_space_operations isofs_aops
= {
1182 .readpage
= isofs_readpage
,
1183 .readpages
= isofs_readpages
,
1187 static int isofs_read_level3_size(struct inode
*inode
)
1189 unsigned long bufsize
= ISOFS_BUFFER_SIZE(inode
);
1190 int high_sierra
= ISOFS_SB(inode
->i_sb
)->s_high_sierra
;
1191 struct buffer_head
*bh
= NULL
;
1192 unsigned long block
, offset
, block_saved
, offset_saved
;
1194 int more_entries
= 0;
1195 struct iso_directory_record
*tmpde
= NULL
;
1196 struct iso_inode_info
*ei
= ISOFS_I(inode
);
1200 /* The first 16 blocks are reserved as the System Area. Thus,
1201 * no inodes can appear in block 0. We use this to flag that
1202 * this is the last section. */
1203 ei
->i_next_section_block
= 0;
1204 ei
->i_next_section_offset
= 0;
1206 block
= ei
->i_iget5_block
;
1207 offset
= ei
->i_iget5_offset
;
1210 struct iso_directory_record
*de
;
1211 unsigned int de_len
;
1214 bh
= sb_bread(inode
->i_sb
, block
);
1218 de
= (struct iso_directory_record
*) (bh
->b_data
+ offset
);
1219 de_len
= *(unsigned char *) de
;
1229 block_saved
= block
;
1230 offset_saved
= offset
;
1233 /* Make sure we have a full directory entry */
1234 if (offset
>= bufsize
) {
1235 int slop
= bufsize
- offset
+ de_len
;
1237 tmpde
= kmalloc(256, GFP_KERNEL
);
1241 memcpy(tmpde
, de
, slop
);
1242 offset
&= bufsize
- 1;
1247 bh
= sb_bread(inode
->i_sb
, block
);
1250 memcpy((void *)tmpde
+slop
, bh
->b_data
, offset
);
1255 inode
->i_size
+= isonum_733(de
->size
);
1257 ei
->i_next_section_block
= block_saved
;
1258 ei
->i_next_section_offset
= offset_saved
;
1261 more_entries
= de
->flags
[-high_sierra
] & 0x80;
1266 } while (more_entries
);
1279 printk(KERN_INFO
"ISOFS: unable to read i-node block %lu\n", block
);
1284 printk(KERN_INFO
"%s: More than 100 file sections ?!?, aborting...\n"
1285 "isofs_read_level3_size: inode=%lu\n",
1286 __func__
, inode
->i_ino
);
1290 static int isofs_read_inode(struct inode
*inode
, int relocated
)
1292 struct super_block
*sb
= inode
->i_sb
;
1293 struct isofs_sb_info
*sbi
= ISOFS_SB(sb
);
1294 unsigned long bufsize
= ISOFS_BUFFER_SIZE(inode
);
1295 unsigned long block
;
1296 int high_sierra
= sbi
->s_high_sierra
;
1297 struct buffer_head
*bh
= NULL
;
1298 struct iso_directory_record
*de
;
1299 struct iso_directory_record
*tmpde
= NULL
;
1300 unsigned int de_len
;
1301 unsigned long offset
;
1302 struct iso_inode_info
*ei
= ISOFS_I(inode
);
1305 block
= ei
->i_iget5_block
;
1306 bh
= sb_bread(inode
->i_sb
, block
);
1310 offset
= ei
->i_iget5_offset
;
1312 de
= (struct iso_directory_record
*) (bh
->b_data
+ offset
);
1313 de_len
= *(unsigned char *) de
;
1315 if (offset
+ de_len
> bufsize
) {
1316 int frag1
= bufsize
- offset
;
1318 tmpde
= kmalloc(de_len
, GFP_KERNEL
);
1319 if (tmpde
== NULL
) {
1320 printk(KERN_INFO
"%s: out of memory\n", __func__
);
1324 memcpy(tmpde
, bh
->b_data
+ offset
, frag1
);
1326 bh
= sb_bread(inode
->i_sb
, ++block
);
1329 memcpy((char *)tmpde
+frag1
, bh
->b_data
, de_len
- frag1
);
1333 inode
->i_ino
= isofs_get_ino(ei
->i_iget5_block
,
1335 ISOFS_BUFFER_BITS(inode
));
1337 /* Assume it is a normal-format file unless told otherwise */
1338 ei
->i_file_format
= isofs_file_normal
;
1340 if (de
->flags
[-high_sierra
] & 2) {
1341 if (sbi
->s_dmode
!= ISOFS_INVALID_MODE
)
1342 inode
->i_mode
= S_IFDIR
| sbi
->s_dmode
;
1344 inode
->i_mode
= S_IFDIR
| S_IRUGO
| S_IXUGO
;
1345 set_nlink(inode
, 1); /*
1346 * Set to 1. We know there are 2, but
1347 * the find utility tries to optimize
1348 * if it is 2, and it screws up. It is
1349 * easier to give 1 which tells find to
1350 * do it the hard way.
1353 if (sbi
->s_fmode
!= ISOFS_INVALID_MODE
) {
1354 inode
->i_mode
= S_IFREG
| sbi
->s_fmode
;
1357 * Set default permissions: r-x for all. The disc
1358 * could be shared with DOS machines so virtually
1359 * anything could be a valid executable.
1361 inode
->i_mode
= S_IFREG
| S_IRUGO
| S_IXUGO
;
1363 set_nlink(inode
, 1);
1365 inode
->i_uid
= sbi
->s_uid
;
1366 inode
->i_gid
= sbi
->s_gid
;
1367 inode
->i_blocks
= 0;
1369 ei
->i_format_parm
[0] = 0;
1370 ei
->i_format_parm
[1] = 0;
1371 ei
->i_format_parm
[2] = 0;
1373 ei
->i_section_size
= isonum_733(de
->size
);
1374 if (de
->flags
[-high_sierra
] & 0x80) {
1375 ret
= isofs_read_level3_size(inode
);
1380 ei
->i_next_section_block
= 0;
1381 ei
->i_next_section_offset
= 0;
1382 inode
->i_size
= isonum_733(de
->size
);
1386 * Some dipshit decided to store some other bit of information
1387 * in the high byte of the file length. Truncate size in case
1388 * this CDROM was mounted with the cruft option.
1392 inode
->i_size
&= 0x00ffffff;
1394 if (de
->interleave
[0]) {
1395 printk(KERN_DEBUG
"ISOFS: Interleaved files not (yet) supported.\n");
1399 /* I have no idea what file_unit_size is used for, so
1400 we will flag it for now */
1401 if (de
->file_unit_size
[0] != 0) {
1402 printk(KERN_DEBUG
"ISOFS: File unit size != 0 for ISO file (%ld).\n",
1406 /* I have no idea what other flag bits are used for, so
1407 we will flag it for now */
1409 if((de
->flags
[-high_sierra
] & ~2)!= 0){
1410 printk(KERN_DEBUG
"ISOFS: Unusual flag settings for ISO file "
1412 inode
->i_ino
, de
->flags
[-high_sierra
]);
1416 inode
->i_mtime
.tv_sec
=
1417 inode
->i_atime
.tv_sec
=
1418 inode
->i_ctime
.tv_sec
= iso_date(de
->date
, high_sierra
);
1419 inode
->i_mtime
.tv_nsec
=
1420 inode
->i_atime
.tv_nsec
=
1421 inode
->i_ctime
.tv_nsec
= 0;
1423 ei
->i_first_extent
= (isonum_733(de
->extent
) +
1424 isonum_711(de
->ext_attr_length
));
1426 /* Set the number of blocks for stat() - should be done before RR */
1427 inode
->i_blocks
= (inode
->i_size
+ 511) >> 9;
1430 * Now test for possible Rock Ridge extensions which will override
1431 * some of these numbers in the inode structure.
1435 parse_rock_ridge_inode(de
, inode
, relocated
);
1436 /* if we want uid/gid set, override the rock ridge setting */
1438 inode
->i_uid
= sbi
->s_uid
;
1440 inode
->i_gid
= sbi
->s_gid
;
1442 /* Now set final access rights if overriding rock ridge setting */
1443 if (S_ISDIR(inode
->i_mode
) && sbi
->s_overriderockperm
&&
1444 sbi
->s_dmode
!= ISOFS_INVALID_MODE
)
1445 inode
->i_mode
= S_IFDIR
| sbi
->s_dmode
;
1446 if (S_ISREG(inode
->i_mode
) && sbi
->s_overriderockperm
&&
1447 sbi
->s_fmode
!= ISOFS_INVALID_MODE
)
1448 inode
->i_mode
= S_IFREG
| sbi
->s_fmode
;
1450 /* Install the inode operations vector */
1451 if (S_ISREG(inode
->i_mode
)) {
1452 inode
->i_fop
= &generic_ro_fops
;
1453 switch (ei
->i_file_format
) {
1454 #ifdef CONFIG_ZISOFS
1455 case isofs_file_compressed
:
1456 inode
->i_data
.a_ops
= &zisofs_aops
;
1460 inode
->i_data
.a_ops
= &isofs_aops
;
1463 } else if (S_ISDIR(inode
->i_mode
)) {
1464 inode
->i_op
= &isofs_dir_inode_operations
;
1465 inode
->i_fop
= &isofs_dir_operations
;
1466 } else if (S_ISLNK(inode
->i_mode
)) {
1467 inode
->i_op
= &page_symlink_inode_operations
;
1468 inode_nohighmem(inode
);
1469 inode
->i_data
.a_ops
= &isofs_symlink_aops
;
1471 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1472 init_special_inode(inode
, inode
->i_mode
, inode
->i_rdev
);
1482 printk(KERN_WARNING
"ISOFS: unable to read i-node block\n");
1487 struct isofs_iget5_callback_data
{
1488 unsigned long block
;
1489 unsigned long offset
;
1492 static int isofs_iget5_test(struct inode
*ino
, void *data
)
1494 struct iso_inode_info
*i
= ISOFS_I(ino
);
1495 struct isofs_iget5_callback_data
*d
=
1496 (struct isofs_iget5_callback_data
*)data
;
1497 return (i
->i_iget5_block
== d
->block
)
1498 && (i
->i_iget5_offset
== d
->offset
);
1501 static int isofs_iget5_set(struct inode
*ino
, void *data
)
1503 struct iso_inode_info
*i
= ISOFS_I(ino
);
1504 struct isofs_iget5_callback_data
*d
=
1505 (struct isofs_iget5_callback_data
*)data
;
1506 i
->i_iget5_block
= d
->block
;
1507 i
->i_iget5_offset
= d
->offset
;
1511 /* Store, in the inode's containing structure, the block and block
1512 * offset that point to the underlying meta-data for the inode. The
1513 * code below is otherwise similar to the iget() code in
1514 * include/linux/fs.h */
1515 struct inode
*__isofs_iget(struct super_block
*sb
,
1516 unsigned long block
,
1517 unsigned long offset
,
1520 unsigned long hashval
;
1521 struct inode
*inode
;
1522 struct isofs_iget5_callback_data data
;
1525 if (offset
>= 1ul << sb
->s_blocksize_bits
)
1526 return ERR_PTR(-EINVAL
);
1529 data
.offset
= offset
;
1531 hashval
= (block
<< sb
->s_blocksize_bits
) | offset
;
1533 inode
= iget5_locked(sb
, hashval
, &isofs_iget5_test
,
1534 &isofs_iget5_set
, &data
);
1537 return ERR_PTR(-ENOMEM
);
1539 if (inode
->i_state
& I_NEW
) {
1540 ret
= isofs_read_inode(inode
, relocated
);
1543 inode
= ERR_PTR(ret
);
1545 unlock_new_inode(inode
);
1552 static struct dentry
*isofs_mount(struct file_system_type
*fs_type
,
1553 int flags
, const char *dev_name
, void *data
)
1555 return mount_bdev(fs_type
, flags
, dev_name
, data
, isofs_fill_super
);
1558 static struct file_system_type iso9660_fs_type
= {
1559 .owner
= THIS_MODULE
,
1561 .mount
= isofs_mount
,
1562 .kill_sb
= kill_block_super
,
1563 .fs_flags
= FS_REQUIRES_DEV
,
1565 MODULE_ALIAS_FS("iso9660");
1566 MODULE_ALIAS("iso9660");
1568 static int __init
init_iso9660_fs(void)
1570 int err
= init_inodecache();
1573 #ifdef CONFIG_ZISOFS
1574 err
= zisofs_init();
1578 err
= register_filesystem(&iso9660_fs_type
);
1583 #ifdef CONFIG_ZISOFS
1587 destroy_inodecache();
1592 static void __exit
exit_iso9660_fs(void)
1594 unregister_filesystem(&iso9660_fs_type
);
1595 #ifdef CONFIG_ZISOFS
1598 destroy_inodecache();
1601 module_init(init_iso9660_fs
)
1602 module_exit(exit_iso9660_fs
)
1603 MODULE_LICENSE("GPL");