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
))
414 * Track numbers are supposed to be in range 1-99, the
415 * mount option starts indexing at 0.
419 popt
->session
= n
+ 1;
422 if (match_int(&args
[0], &option
))
424 popt
->sbsector
= option
;
435 if (match_int(&args
[0], &option
))
437 popt
->uid
= make_kuid(current_user_ns(), option
);
438 if (!uid_valid(popt
->uid
))
443 if (match_int(&args
[0], &option
))
445 popt
->gid
= make_kgid(current_user_ns(), option
);
446 if (!gid_valid(popt
->gid
))
451 if (match_int(&args
[0], &option
))
453 popt
->fmode
= option
;
456 if (match_int(&args
[0], &option
))
458 popt
->dmode
= option
;
460 case Opt_overriderockperm
:
461 popt
->overriderockperm
= 1;
464 if (match_int(&args
[0], &option
))
467 if (n
!= 512 && n
!= 1024 && n
!= 2048)
472 popt
->nocompress
= 1;
482 * Display the mount options in /proc/mounts.
484 static int isofs_show_options(struct seq_file
*m
, struct dentry
*root
)
486 struct isofs_sb_info
*sbi
= ISOFS_SB(root
->d_sb
);
488 if (!sbi
->s_rock
) seq_puts(m
, ",norock");
489 else if (!sbi
->s_joliet_level
) seq_puts(m
, ",nojoliet");
490 if (sbi
->s_cruft
) seq_puts(m
, ",cruft");
491 if (sbi
->s_hide
) seq_puts(m
, ",hide");
492 if (sbi
->s_nocompress
) seq_puts(m
, ",nocompress");
493 if (sbi
->s_overriderockperm
) seq_puts(m
, ",overriderockperm");
494 if (sbi
->s_showassoc
) seq_puts(m
, ",showassoc");
495 if (sbi
->s_utf8
) seq_puts(m
, ",utf8");
497 if (sbi
->s_check
) seq_printf(m
, ",check=%c", sbi
->s_check
);
498 if (sbi
->s_mapping
) seq_printf(m
, ",map=%c", sbi
->s_mapping
);
499 if (sbi
->s_session
!= 255) seq_printf(m
, ",session=%u", sbi
->s_session
- 1);
500 if (sbi
->s_sbsector
!= -1) seq_printf(m
, ",sbsector=%u", sbi
->s_sbsector
);
502 if (root
->d_sb
->s_blocksize
!= 1024)
503 seq_printf(m
, ",blocksize=%lu", root
->d_sb
->s_blocksize
);
506 seq_printf(m
, ",uid=%u",
507 from_kuid_munged(&init_user_ns
, sbi
->s_uid
));
509 seq_printf(m
, ",gid=%u",
510 from_kgid_munged(&init_user_ns
, sbi
->s_gid
));
512 if (sbi
->s_dmode
!= ISOFS_INVALID_MODE
)
513 seq_printf(m
, ",dmode=%o", sbi
->s_dmode
);
514 if (sbi
->s_fmode
!= ISOFS_INVALID_MODE
)
515 seq_printf(m
, ",fmode=%o", sbi
->s_fmode
);
517 if (sbi
->s_nls_iocharset
&&
518 strcmp(sbi
->s_nls_iocharset
->charset
, CONFIG_NLS_DEFAULT
) != 0)
519 seq_printf(m
, ",iocharset=%s", sbi
->s_nls_iocharset
->charset
);
524 * look if the driver can tell the multi session redirection value
526 * don't change this if you don't know what you do, please!
527 * Multisession is legal only with XA disks.
528 * A non-XA disk with more than one volume descriptor may do it right, but
529 * usually is written in a nowhere standardized "multi-partition" manner.
530 * Multisession uses absolute addressing (solely the first frame of the whole
531 * track is #0), multi-partition uses relative addressing (each first frame of
532 * each track is #0), and a track is not a session.
534 * A broken CDwriter software or drive firmware does not set new standards,
535 * at least not if conflicting with the existing ones.
539 #define WE_OBEY_THE_WRITTEN_STANDARDS 1
541 static unsigned int isofs_get_last_session(struct super_block
*sb
, s32 session
)
543 struct cdrom_multisession ms_info
;
544 unsigned int vol_desc_start
;
545 struct block_device
*bdev
= sb
->s_bdev
;
549 ms_info
.addr_format
=CDROM_LBA
;
551 struct cdrom_tocentry Te
;
552 Te
.cdte_track
=session
;
553 Te
.cdte_format
=CDROM_LBA
;
554 i
= ioctl_by_bdev(bdev
, CDROMREADTOCENTRY
, (unsigned long) &Te
);
556 printk(KERN_DEBUG
"ISOFS: Session %d start %d type %d\n",
557 session
, Te
.cdte_addr
.lba
,
558 Te
.cdte_ctrl
&CDROM_DATA_TRACK
);
559 if ((Te
.cdte_ctrl
&CDROM_DATA_TRACK
) == 4)
560 return Te
.cdte_addr
.lba
;
563 printk(KERN_ERR
"ISOFS: Invalid session number or type of track\n");
565 i
= ioctl_by_bdev(bdev
, CDROMMULTISESSION
, (unsigned long) &ms_info
);
567 printk(KERN_ERR
"ISOFS: Invalid session number\n");
569 printk(KERN_DEBUG
"isofs.inode: CDROMMULTISESSION: rc=%d\n",i
);
571 printk(KERN_DEBUG
"isofs.inode: XA disk: %s\n",ms_info
.xa_flag
?"yes":"no");
572 printk(KERN_DEBUG
"isofs.inode: vol_desc_start = %d\n", ms_info
.addr
.lba
);
576 #if WE_OBEY_THE_WRITTEN_STANDARDS
577 if (ms_info
.xa_flag
) /* necessary for a valid ms_info.addr */
579 vol_desc_start
=ms_info
.addr
.lba
;
580 return vol_desc_start
;
584 * Check if root directory is empty (has less than 3 files).
586 * Used to detect broken CDs where ISO root directory is empty but Joliet root
587 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
588 * (and Joliet used instead) or else no files would be visible.
590 static bool rootdir_empty(struct super_block
*sb
, unsigned long block
)
592 int offset
= 0, files
= 0, de_len
;
593 struct iso_directory_record
*de
;
594 struct buffer_head
*bh
;
596 bh
= sb_bread(sb
, block
);
600 de
= (struct iso_directory_record
*) (bh
->b_data
+ offset
);
601 de_len
= *(unsigned char *) de
;
612 * Initialize the superblock and read the root inode.
614 * Note: a check_disk_change() has been done immediately prior
615 * to this call, so we don't need to check again.
617 static int isofs_fill_super(struct super_block
*s
, void *data
, int silent
)
619 struct buffer_head
*bh
= NULL
, *pri_bh
= NULL
;
620 struct hs_primary_descriptor
*h_pri
= NULL
;
621 struct iso_primary_descriptor
*pri
= NULL
;
622 struct iso_supplementary_descriptor
*sec
= NULL
;
623 struct iso_directory_record
*rootp
;
625 struct iso9660_options opt
;
626 struct isofs_sb_info
*sbi
;
627 unsigned long first_data_zone
;
628 int joliet_level
= 0;
629 int iso_blknum
, block
;
631 int table
, error
= -EINVAL
;
632 unsigned int vol_desc_start
;
634 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
639 if (!parse_options((char *)data
, &opt
))
643 * First of all, get the hardware blocksize for this device.
644 * If we don't know what it is, or the hardware blocksize is
645 * larger than the blocksize the user specified, then use
649 * What if bugger tells us to go beyond page size?
651 opt
.blocksize
= sb_min_blocksize(s
, opt
.blocksize
);
653 sbi
->s_high_sierra
= 0; /* default is iso9660 */
654 sbi
->s_session
= opt
.session
;
655 sbi
->s_sbsector
= opt
.sbsector
;
657 vol_desc_start
= (opt
.sbsector
!= -1) ?
658 opt
.sbsector
: isofs_get_last_session(s
,opt
.session
);
660 for (iso_blknum
= vol_desc_start
+16;
661 iso_blknum
< vol_desc_start
+100; iso_blknum
++) {
662 struct hs_volume_descriptor
*hdp
;
663 struct iso_volume_descriptor
*vdp
;
665 block
= iso_blknum
<< (ISOFS_BLOCK_BITS
- s
->s_blocksize_bits
);
666 if (!(bh
= sb_bread(s
, block
)))
669 vdp
= (struct iso_volume_descriptor
*)bh
->b_data
;
670 hdp
= (struct hs_volume_descriptor
*)bh
->b_data
;
673 * Due to the overlapping physical location of the descriptors,
674 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
675 * proper identification in this case, we first check for ISO.
677 if (strncmp (vdp
->id
, ISO_STANDARD_ID
, sizeof vdp
->id
) == 0) {
678 if (isonum_711(vdp
->type
) == ISO_VD_END
)
680 if (isonum_711(vdp
->type
) == ISO_VD_PRIMARY
) {
682 pri
= (struct iso_primary_descriptor
*)vdp
;
683 /* Save the buffer in case we need it ... */
689 else if (isonum_711(vdp
->type
) == ISO_VD_SUPPLEMENTARY
) {
690 sec
= (struct iso_supplementary_descriptor
*)vdp
;
691 if (sec
->escape
[0] == 0x25 && sec
->escape
[1] == 0x2f) {
693 if (sec
->escape
[2] == 0x40)
695 else if (sec
->escape
[2] == 0x43)
697 else if (sec
->escape
[2] == 0x45)
700 printk(KERN_DEBUG
"ISO 9660 Extensions: "
701 "Microsoft Joliet Level %d\n",
706 /* Unknown supplementary volume descriptor */
712 if (strncmp (hdp
->id
, HS_STANDARD_ID
, sizeof hdp
->id
) == 0) {
713 if (isonum_711(hdp
->type
) != ISO_VD_PRIMARY
)
716 sbi
->s_high_sierra
= 1;
718 h_pri
= (struct hs_primary_descriptor
*)vdp
;
723 /* Just skip any volume descriptors we don't recognize */
729 * If we fall through, either no volume descriptor was found,
730 * or else we passed a primary descriptor looking for others.
733 goto out_unknown_format
;
739 /* We don't support read-write mounts */
740 if (!(s
->s_flags
& MS_RDONLY
)) {
745 if (joliet_level
&& (pri
== NULL
|| !opt
.rock
)) {
746 /* This is the case of Joliet with the norock mount flag.
747 * A disc with both Joliet and Rock Ridge is handled later
749 pri
= (struct iso_primary_descriptor
*) sec
;
752 if(sbi
->s_high_sierra
){
753 rootp
= (struct iso_directory_record
*) h_pri
->root_directory_record
;
754 sbi
->s_nzones
= isonum_733(h_pri
->volume_space_size
);
755 sbi
->s_log_zone_size
= isonum_723(h_pri
->logical_block_size
);
756 sbi
->s_max_size
= isonum_733(h_pri
->volume_space_size
);
760 rootp
= (struct iso_directory_record
*) pri
->root_directory_record
;
761 sbi
->s_nzones
= isonum_733(pri
->volume_space_size
);
762 sbi
->s_log_zone_size
= isonum_723(pri
->logical_block_size
);
763 sbi
->s_max_size
= isonum_733(pri
->volume_space_size
);
766 sbi
->s_ninodes
= 0; /* No way to figure this out easily */
768 orig_zonesize
= sbi
->s_log_zone_size
;
770 * If the zone size is smaller than the hardware sector size,
771 * this is a fatal error. This would occur if the disc drive
772 * had sectors that were 2048 bytes, but the filesystem had
773 * blocks that were 512 bytes (which should only very rarely
776 if (orig_zonesize
< opt
.blocksize
)
779 /* RDE: convert log zone size to bit shift */
780 switch (sbi
->s_log_zone_size
) {
781 case 512: sbi
->s_log_zone_size
= 9; break;
782 case 1024: sbi
->s_log_zone_size
= 10; break;
783 case 2048: sbi
->s_log_zone_size
= 11; break;
786 goto out_bad_zone_size
;
789 s
->s_magic
= ISOFS_SUPER_MAGIC
;
792 * With multi-extent files, file size is only limited by the maximum
793 * size of a file system, which is 8 TB.
795 s
->s_maxbytes
= 0x80000000000LL
;
797 /* Set this for reference. Its not currently used except on write
798 which we don't have .. */
800 first_data_zone
= isonum_733(rootp
->extent
) +
801 isonum_711(rootp
->ext_attr_length
);
802 sbi
->s_firstdatazone
= first_data_zone
;
804 printk(KERN_DEBUG
"ISOFS: Max size:%ld Log zone size:%ld\n",
805 sbi
->s_max_size
, 1UL << sbi
->s_log_zone_size
);
806 printk(KERN_DEBUG
"ISOFS: First datazone:%ld\n", sbi
->s_firstdatazone
);
807 if(sbi
->s_high_sierra
)
808 printk(KERN_DEBUG
"ISOFS: Disc in High Sierra format.\n");
812 * If the Joliet level is set, we _may_ decide to use the
813 * secondary descriptor, but can't be sure until after we
814 * read the root inode. But before reading the root inode
815 * we may need to change the device blocksize, and would
816 * rather release the old buffer first. So, we cache the
817 * first_data_zone value from the secondary descriptor.
820 pri
= (struct iso_primary_descriptor
*) sec
;
821 rootp
= (struct iso_directory_record
*)
822 pri
->root_directory_record
;
823 first_data_zone
= isonum_733(rootp
->extent
) +
824 isonum_711(rootp
->ext_attr_length
);
828 * We're all done using the volume descriptor, and may need
829 * to change the device blocksize, so release the buffer now.
835 * Force the blocksize to 512 for 512 byte sectors. The file
836 * read primitives really get it wrong in a bad way if we don't
839 * Note - we should never be setting the blocksize to something
840 * less than the hardware sector size for the device. If we
841 * do, we would end up having to read larger buffers and split
842 * out portions to satisfy requests.
844 * Note2- the idea here is that we want to deal with the optimal
845 * zonesize in the filesystem. If we have it set to something less,
846 * then we have horrible problems with trying to piece together
847 * bits of adjacent blocks in order to properly read directory
848 * entries. By forcing the blocksize in this way, we ensure
849 * that we will never be required to do this.
851 sb_set_blocksize(s
, orig_zonesize
);
853 sbi
->s_nls_iocharset
= NULL
;
856 if (joliet_level
&& opt
.utf8
== 0) {
857 char *p
= opt
.iocharset
? opt
.iocharset
: CONFIG_NLS_DEFAULT
;
858 sbi
->s_nls_iocharset
= load_nls(p
);
859 if (! sbi
->s_nls_iocharset
) {
860 /* Fail only if explicit charset specified */
863 sbi
->s_nls_iocharset
= load_nls_default();
867 s
->s_op
= &isofs_sops
;
868 s
->s_export_op
= &isofs_export_ops
;
869 sbi
->s_mapping
= opt
.map
;
870 sbi
->s_rock
= (opt
.rock
? 2 : 0);
871 sbi
->s_rock_offset
= -1; /* initial offset, will guess until SP is found*/
872 sbi
->s_cruft
= opt
.cruft
;
873 sbi
->s_hide
= opt
.hide
;
874 sbi
->s_showassoc
= opt
.showassoc
;
875 sbi
->s_uid
= opt
.uid
;
876 sbi
->s_gid
= opt
.gid
;
877 sbi
->s_uid_set
= opt
.uid_set
;
878 sbi
->s_gid_set
= opt
.gid_set
;
879 sbi
->s_utf8
= opt
.utf8
;
880 sbi
->s_nocompress
= opt
.nocompress
;
881 sbi
->s_overriderockperm
= opt
.overriderockperm
;
883 * It would be incredibly stupid to allow people to mark every file
884 * on the disk as suid, so we merely allow them to set the default
887 if (opt
.fmode
!= ISOFS_INVALID_MODE
)
888 sbi
->s_fmode
= opt
.fmode
& 0777;
890 sbi
->s_fmode
= ISOFS_INVALID_MODE
;
891 if (opt
.dmode
!= ISOFS_INVALID_MODE
)
892 sbi
->s_dmode
= opt
.dmode
& 0777;
894 sbi
->s_dmode
= ISOFS_INVALID_MODE
;
897 * Read the root inode, which _may_ result in changing
898 * the s_rock flag. Once we have the final s_rock value,
899 * we then decide whether to use the Joliet descriptor.
901 inode
= isofs_iget(s
, sbi
->s_firstdatazone
, 0);
906 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
907 * correct Joliet root directory.
909 if (sbi
->s_rock
== 1 && joliet_level
&&
910 rootdir_empty(s
, sbi
->s_firstdatazone
)) {
912 "ISOFS: primary root directory is empty. "
913 "Disabling Rock Ridge and switching to Joliet.");
918 * If this disk has both Rock Ridge and Joliet on it, then we
919 * want to use Rock Ridge by default. This can be overridden
920 * by using the norock mount option. There is still one other
921 * possibility that is not taken into account: a Rock Ridge
922 * CD with Unicode names. Until someone sees such a beast, it
923 * will not be supported.
925 if (sbi
->s_rock
== 1) {
927 } else if (joliet_level
) {
929 if (sbi
->s_firstdatazone
!= first_data_zone
) {
930 sbi
->s_firstdatazone
= first_data_zone
;
932 "ISOFS: changing to secondary root\n");
934 inode
= isofs_iget(s
, sbi
->s_firstdatazone
, 0);
940 if (opt
.check
== 'u') {
941 /* Only Joliet is case insensitive by default */
947 sbi
->s_joliet_level
= joliet_level
;
949 /* Make sure the root inode is a directory */
950 if (!S_ISDIR(inode
->i_mode
)) {
952 "isofs_fill_super: root inode is not a directory. "
953 "Corrupted media?\n");
960 if (opt
.check
== 'r')
962 sbi
->s_check
= opt
.check
;
965 s
->s_d_op
= &isofs_dentry_ops
[table
- 1];
967 /* get the root dentry */
968 s
->s_root
= d_make_root(inode
);
974 kfree(opt
.iocharset
);
979 * Display error messages and free resources.
985 error
= PTR_ERR(inode
);
986 if (error
!= -ENOMEM
)
987 printk(KERN_WARNING
"%s: get root inode failed\n", __func__
);
990 unload_nls(sbi
->s_nls_iocharset
);
994 printk(KERN_WARNING
"%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
995 __func__
, s
->s_id
, iso_blknum
, block
);
998 printk(KERN_WARNING
"ISOFS: Bad logical zone size %ld\n",
999 sbi
->s_log_zone_size
);
1002 printk(KERN_WARNING
"ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
1003 orig_zonesize
, opt
.blocksize
);
1007 printk(KERN_WARNING
"ISOFS: Unable to identify CD-ROM format.\n");
1013 kfree(opt
.iocharset
);
1015 s
->s_fs_info
= NULL
;
1019 static int isofs_statfs (struct dentry
*dentry
, struct kstatfs
*buf
)
1021 struct super_block
*sb
= dentry
->d_sb
;
1022 u64 id
= huge_encode_dev(sb
->s_bdev
->bd_dev
);
1024 buf
->f_type
= ISOFS_SUPER_MAGIC
;
1025 buf
->f_bsize
= sb
->s_blocksize
;
1026 buf
->f_blocks
= (ISOFS_SB(sb
)->s_nzones
1027 << (ISOFS_SB(sb
)->s_log_zone_size
- sb
->s_blocksize_bits
));
1030 buf
->f_files
= ISOFS_SB(sb
)->s_ninodes
;
1032 buf
->f_fsid
.val
[0] = (u32
)id
;
1033 buf
->f_fsid
.val
[1] = (u32
)(id
>> 32);
1034 buf
->f_namelen
= NAME_MAX
;
1039 * Get a set of blocks; filling in buffer_heads if already allocated
1040 * or getblk() if they are not. Returns the number of blocks inserted
1043 int isofs_get_blocks(struct inode
*inode
, sector_t iblock
,
1044 struct buffer_head
**bh
, unsigned long nblocks
)
1046 unsigned long b_off
= iblock
;
1047 unsigned offset
, sect_size
;
1048 unsigned int firstext
;
1049 unsigned long nextblk
, nextoff
;
1050 int section
, rv
, error
;
1051 struct iso_inode_info
*ei
= ISOFS_I(inode
);
1055 if (iblock
!= b_off
) {
1056 printk(KERN_DEBUG
"%s: block number too large\n", __func__
);
1062 firstext
= ei
->i_first_extent
;
1063 sect_size
= ei
->i_section_size
>> ISOFS_BUFFER_BITS(inode
);
1064 nextblk
= ei
->i_next_section_block
;
1065 nextoff
= ei
->i_next_section_offset
;
1069 /* If we are *way* beyond the end of the file, print a message.
1070 * Access beyond the end of the file up to the next page boundary
1071 * is normal, however because of the way the page cache works.
1072 * In this case, we just return 0 so that we can properly fill
1073 * the page with useless information without generating any
1076 if (b_off
> ((inode
->i_size
+ PAGE_SIZE
- 1) >> ISOFS_BUFFER_BITS(inode
))) {
1077 printk(KERN_DEBUG
"%s: block >= EOF (%lu, %llu)\n",
1079 (unsigned long long)inode
->i_size
);
1083 /* On the last section, nextblk == 0, section size is likely to
1084 * exceed sect_size by a partial block, and access beyond the
1085 * end of the file will reach beyond the section size, too.
1087 while (nextblk
&& (b_off
>= (offset
+ sect_size
))) {
1088 struct inode
*ninode
;
1090 offset
+= sect_size
;
1091 ninode
= isofs_iget(inode
->i_sb
, nextblk
, nextoff
);
1092 if (IS_ERR(ninode
)) {
1093 error
= PTR_ERR(ninode
);
1096 firstext
= ISOFS_I(ninode
)->i_first_extent
;
1097 sect_size
= ISOFS_I(ninode
)->i_section_size
>> ISOFS_BUFFER_BITS(ninode
);
1098 nextblk
= ISOFS_I(ninode
)->i_next_section_block
;
1099 nextoff
= ISOFS_I(ninode
)->i_next_section_offset
;
1102 if (++section
> 100) {
1103 printk(KERN_DEBUG
"%s: More than 100 file sections ?!?"
1104 " aborting...\n", __func__
);
1105 printk(KERN_DEBUG
"%s: block=%lu firstext=%u sect_size=%u "
1106 "nextblk=%lu nextoff=%lu\n", __func__
,
1107 b_off
, firstext
, (unsigned) sect_size
,
1114 map_bh(*bh
, inode
->i_sb
, firstext
+ b_off
- offset
);
1116 *bh
= sb_getblk(inode
->i_sb
, firstext
+b_off
-offset
);
1120 bh
++; /* Next buffer head */
1121 b_off
++; /* Next buffer offset */
1128 return rv
!= 0 ? rv
: error
;
1132 * Used by the standard interfaces.
1134 static int isofs_get_block(struct inode
*inode
, sector_t iblock
,
1135 struct buffer_head
*bh_result
, int create
)
1140 printk(KERN_DEBUG
"%s: Kernel tries to allocate a block\n", __func__
);
1144 ret
= isofs_get_blocks(inode
, iblock
, &bh_result
, 1);
1145 return ret
< 0 ? ret
: 0;
1148 static int isofs_bmap(struct inode
*inode
, sector_t block
)
1150 struct buffer_head dummy
;
1154 dummy
.b_blocknr
= -1000;
1155 error
= isofs_get_block(inode
, block
, &dummy
, 0);
1157 return dummy
.b_blocknr
;
1161 struct buffer_head
*isofs_bread(struct inode
*inode
, sector_t block
)
1163 sector_t blknr
= isofs_bmap(inode
, block
);
1166 return sb_bread(inode
->i_sb
, blknr
);
1169 static int isofs_readpage(struct file
*file
, struct page
*page
)
1171 return mpage_readpage(page
, isofs_get_block
);
1174 static int isofs_readpages(struct file
*file
, struct address_space
*mapping
,
1175 struct list_head
*pages
, unsigned nr_pages
)
1177 return mpage_readpages(mapping
, pages
, nr_pages
, isofs_get_block
);
1180 static sector_t
_isofs_bmap(struct address_space
*mapping
, sector_t block
)
1182 return generic_block_bmap(mapping
,block
,isofs_get_block
);
1185 static const struct address_space_operations isofs_aops
= {
1186 .readpage
= isofs_readpage
,
1187 .readpages
= isofs_readpages
,
1191 static int isofs_read_level3_size(struct inode
*inode
)
1193 unsigned long bufsize
= ISOFS_BUFFER_SIZE(inode
);
1194 int high_sierra
= ISOFS_SB(inode
->i_sb
)->s_high_sierra
;
1195 struct buffer_head
*bh
= NULL
;
1196 unsigned long block
, offset
, block_saved
, offset_saved
;
1198 int more_entries
= 0;
1199 struct iso_directory_record
*tmpde
= NULL
;
1200 struct iso_inode_info
*ei
= ISOFS_I(inode
);
1204 /* The first 16 blocks are reserved as the System Area. Thus,
1205 * no inodes can appear in block 0. We use this to flag that
1206 * this is the last section. */
1207 ei
->i_next_section_block
= 0;
1208 ei
->i_next_section_offset
= 0;
1210 block
= ei
->i_iget5_block
;
1211 offset
= ei
->i_iget5_offset
;
1214 struct iso_directory_record
*de
;
1215 unsigned int de_len
;
1218 bh
= sb_bread(inode
->i_sb
, block
);
1222 de
= (struct iso_directory_record
*) (bh
->b_data
+ offset
);
1223 de_len
= *(unsigned char *) de
;
1233 block_saved
= block
;
1234 offset_saved
= offset
;
1237 /* Make sure we have a full directory entry */
1238 if (offset
>= bufsize
) {
1239 int slop
= bufsize
- offset
+ de_len
;
1241 tmpde
= kmalloc(256, GFP_KERNEL
);
1245 memcpy(tmpde
, de
, slop
);
1246 offset
&= bufsize
- 1;
1251 bh
= sb_bread(inode
->i_sb
, block
);
1254 memcpy((void *)tmpde
+slop
, bh
->b_data
, offset
);
1259 inode
->i_size
+= isonum_733(de
->size
);
1261 ei
->i_next_section_block
= block_saved
;
1262 ei
->i_next_section_offset
= offset_saved
;
1265 more_entries
= de
->flags
[-high_sierra
] & 0x80;
1270 } while (more_entries
);
1283 printk(KERN_INFO
"ISOFS: unable to read i-node block %lu\n", block
);
1288 printk(KERN_INFO
"%s: More than 100 file sections ?!?, aborting...\n"
1289 "isofs_read_level3_size: inode=%lu\n",
1290 __func__
, inode
->i_ino
);
1294 static int isofs_read_inode(struct inode
*inode
, int relocated
)
1296 struct super_block
*sb
= inode
->i_sb
;
1297 struct isofs_sb_info
*sbi
= ISOFS_SB(sb
);
1298 unsigned long bufsize
= ISOFS_BUFFER_SIZE(inode
);
1299 unsigned long block
;
1300 int high_sierra
= sbi
->s_high_sierra
;
1301 struct buffer_head
*bh
= NULL
;
1302 struct iso_directory_record
*de
;
1303 struct iso_directory_record
*tmpde
= NULL
;
1304 unsigned int de_len
;
1305 unsigned long offset
;
1306 struct iso_inode_info
*ei
= ISOFS_I(inode
);
1309 block
= ei
->i_iget5_block
;
1310 bh
= sb_bread(inode
->i_sb
, block
);
1314 offset
= ei
->i_iget5_offset
;
1316 de
= (struct iso_directory_record
*) (bh
->b_data
+ offset
);
1317 de_len
= *(unsigned char *) de
;
1319 if (offset
+ de_len
> bufsize
) {
1320 int frag1
= bufsize
- offset
;
1322 tmpde
= kmalloc(de_len
, GFP_KERNEL
);
1323 if (tmpde
== NULL
) {
1324 printk(KERN_INFO
"%s: out of memory\n", __func__
);
1328 memcpy(tmpde
, bh
->b_data
+ offset
, frag1
);
1330 bh
= sb_bread(inode
->i_sb
, ++block
);
1333 memcpy((char *)tmpde
+frag1
, bh
->b_data
, de_len
- frag1
);
1337 inode
->i_ino
= isofs_get_ino(ei
->i_iget5_block
,
1339 ISOFS_BUFFER_BITS(inode
));
1341 /* Assume it is a normal-format file unless told otherwise */
1342 ei
->i_file_format
= isofs_file_normal
;
1344 if (de
->flags
[-high_sierra
] & 2) {
1345 if (sbi
->s_dmode
!= ISOFS_INVALID_MODE
)
1346 inode
->i_mode
= S_IFDIR
| sbi
->s_dmode
;
1348 inode
->i_mode
= S_IFDIR
| S_IRUGO
| S_IXUGO
;
1349 set_nlink(inode
, 1); /*
1350 * Set to 1. We know there are 2, but
1351 * the find utility tries to optimize
1352 * if it is 2, and it screws up. It is
1353 * easier to give 1 which tells find to
1354 * do it the hard way.
1357 if (sbi
->s_fmode
!= ISOFS_INVALID_MODE
) {
1358 inode
->i_mode
= S_IFREG
| sbi
->s_fmode
;
1361 * Set default permissions: r-x for all. The disc
1362 * could be shared with DOS machines so virtually
1363 * anything could be a valid executable.
1365 inode
->i_mode
= S_IFREG
| S_IRUGO
| S_IXUGO
;
1367 set_nlink(inode
, 1);
1369 inode
->i_uid
= sbi
->s_uid
;
1370 inode
->i_gid
= sbi
->s_gid
;
1371 inode
->i_blocks
= 0;
1373 ei
->i_format_parm
[0] = 0;
1374 ei
->i_format_parm
[1] = 0;
1375 ei
->i_format_parm
[2] = 0;
1377 ei
->i_section_size
= isonum_733(de
->size
);
1378 if (de
->flags
[-high_sierra
] & 0x80) {
1379 ret
= isofs_read_level3_size(inode
);
1384 ei
->i_next_section_block
= 0;
1385 ei
->i_next_section_offset
= 0;
1386 inode
->i_size
= isonum_733(de
->size
);
1390 * Some dipshit decided to store some other bit of information
1391 * in the high byte of the file length. Truncate size in case
1392 * this CDROM was mounted with the cruft option.
1396 inode
->i_size
&= 0x00ffffff;
1398 if (de
->interleave
[0]) {
1399 printk(KERN_DEBUG
"ISOFS: Interleaved files not (yet) supported.\n");
1403 /* I have no idea what file_unit_size is used for, so
1404 we will flag it for now */
1405 if (de
->file_unit_size
[0] != 0) {
1406 printk(KERN_DEBUG
"ISOFS: File unit size != 0 for ISO file (%ld).\n",
1410 /* I have no idea what other flag bits are used for, so
1411 we will flag it for now */
1413 if((de
->flags
[-high_sierra
] & ~2)!= 0){
1414 printk(KERN_DEBUG
"ISOFS: Unusual flag settings for ISO file "
1416 inode
->i_ino
, de
->flags
[-high_sierra
]);
1420 inode
->i_mtime
.tv_sec
=
1421 inode
->i_atime
.tv_sec
=
1422 inode
->i_ctime
.tv_sec
= iso_date(de
->date
, high_sierra
);
1423 inode
->i_mtime
.tv_nsec
=
1424 inode
->i_atime
.tv_nsec
=
1425 inode
->i_ctime
.tv_nsec
= 0;
1427 ei
->i_first_extent
= (isonum_733(de
->extent
) +
1428 isonum_711(de
->ext_attr_length
));
1430 /* Set the number of blocks for stat() - should be done before RR */
1431 inode
->i_blocks
= (inode
->i_size
+ 511) >> 9;
1434 * Now test for possible Rock Ridge extensions which will override
1435 * some of these numbers in the inode structure.
1439 parse_rock_ridge_inode(de
, inode
, relocated
);
1440 /* if we want uid/gid set, override the rock ridge setting */
1442 inode
->i_uid
= sbi
->s_uid
;
1444 inode
->i_gid
= sbi
->s_gid
;
1446 /* Now set final access rights if overriding rock ridge setting */
1447 if (S_ISDIR(inode
->i_mode
) && sbi
->s_overriderockperm
&&
1448 sbi
->s_dmode
!= ISOFS_INVALID_MODE
)
1449 inode
->i_mode
= S_IFDIR
| sbi
->s_dmode
;
1450 if (S_ISREG(inode
->i_mode
) && sbi
->s_overriderockperm
&&
1451 sbi
->s_fmode
!= ISOFS_INVALID_MODE
)
1452 inode
->i_mode
= S_IFREG
| sbi
->s_fmode
;
1454 /* Install the inode operations vector */
1455 if (S_ISREG(inode
->i_mode
)) {
1456 inode
->i_fop
= &generic_ro_fops
;
1457 switch (ei
->i_file_format
) {
1458 #ifdef CONFIG_ZISOFS
1459 case isofs_file_compressed
:
1460 inode
->i_data
.a_ops
= &zisofs_aops
;
1464 inode
->i_data
.a_ops
= &isofs_aops
;
1467 } else if (S_ISDIR(inode
->i_mode
)) {
1468 inode
->i_op
= &isofs_dir_inode_operations
;
1469 inode
->i_fop
= &isofs_dir_operations
;
1470 } else if (S_ISLNK(inode
->i_mode
)) {
1471 inode
->i_op
= &page_symlink_inode_operations
;
1472 inode_nohighmem(inode
);
1473 inode
->i_data
.a_ops
= &isofs_symlink_aops
;
1475 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1476 init_special_inode(inode
, inode
->i_mode
, inode
->i_rdev
);
1486 printk(KERN_WARNING
"ISOFS: unable to read i-node block\n");
1491 struct isofs_iget5_callback_data
{
1492 unsigned long block
;
1493 unsigned long offset
;
1496 static int isofs_iget5_test(struct inode
*ino
, void *data
)
1498 struct iso_inode_info
*i
= ISOFS_I(ino
);
1499 struct isofs_iget5_callback_data
*d
=
1500 (struct isofs_iget5_callback_data
*)data
;
1501 return (i
->i_iget5_block
== d
->block
)
1502 && (i
->i_iget5_offset
== d
->offset
);
1505 static int isofs_iget5_set(struct inode
*ino
, void *data
)
1507 struct iso_inode_info
*i
= ISOFS_I(ino
);
1508 struct isofs_iget5_callback_data
*d
=
1509 (struct isofs_iget5_callback_data
*)data
;
1510 i
->i_iget5_block
= d
->block
;
1511 i
->i_iget5_offset
= d
->offset
;
1515 /* Store, in the inode's containing structure, the block and block
1516 * offset that point to the underlying meta-data for the inode. The
1517 * code below is otherwise similar to the iget() code in
1518 * include/linux/fs.h */
1519 struct inode
*__isofs_iget(struct super_block
*sb
,
1520 unsigned long block
,
1521 unsigned long offset
,
1524 unsigned long hashval
;
1525 struct inode
*inode
;
1526 struct isofs_iget5_callback_data data
;
1529 if (offset
>= 1ul << sb
->s_blocksize_bits
)
1530 return ERR_PTR(-EINVAL
);
1533 data
.offset
= offset
;
1535 hashval
= (block
<< sb
->s_blocksize_bits
) | offset
;
1537 inode
= iget5_locked(sb
, hashval
, &isofs_iget5_test
,
1538 &isofs_iget5_set
, &data
);
1541 return ERR_PTR(-ENOMEM
);
1543 if (inode
->i_state
& I_NEW
) {
1544 ret
= isofs_read_inode(inode
, relocated
);
1547 inode
= ERR_PTR(ret
);
1549 unlock_new_inode(inode
);
1556 static struct dentry
*isofs_mount(struct file_system_type
*fs_type
,
1557 int flags
, const char *dev_name
, void *data
)
1559 return mount_bdev(fs_type
, flags
, dev_name
, data
, isofs_fill_super
);
1562 static struct file_system_type iso9660_fs_type
= {
1563 .owner
= THIS_MODULE
,
1565 .mount
= isofs_mount
,
1566 .kill_sb
= kill_block_super
,
1567 .fs_flags
= FS_REQUIRES_DEV
,
1569 MODULE_ALIAS_FS("iso9660");
1570 MODULE_ALIAS("iso9660");
1572 static int __init
init_iso9660_fs(void)
1574 int err
= init_inodecache();
1577 #ifdef CONFIG_ZISOFS
1578 err
= zisofs_init();
1582 err
= register_filesystem(&iso9660_fs_type
);
1587 #ifdef CONFIG_ZISOFS
1591 destroy_inodecache();
1596 static void __exit
exit_iso9660_fs(void)
1598 unregister_filesystem(&iso9660_fs_type
);
1599 #ifdef CONFIG_ZISOFS
1602 destroy_inodecache();
1605 module_init(init_iso9660_fs
)
1606 module_exit(exit_iso9660_fs
)
1607 MODULE_LICENSE("GPL");