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super.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* super.c
*
* PURPOSE
* Super block routines for the OSTA-UDF(tm) filesystem.
*
* DESCRIPTION
* OSTA-UDF(tm) = Optical Storage Technology Association
* Universal Disk Format.
*
* This code is based on version 2.00 of the UDF specification,
* and revision 3 of the ECMA 167 standard [equivalent to ISO 13346].
* http://www.osta.org/
* https://www.ecma.ch/
* https://www.iso.org/
*
* COPYRIGHT
* (C) 1998 Dave Boynton
* (C) 1998-2004 Ben Fennema
* (C) 2000 Stelias Computing Inc
*
* HISTORY
*
* 09/24/98 dgb changed to allow compiling outside of kernel, and
* added some debugging.
* 10/01/98 dgb updated to allow (some) possibility of compiling w/2.0.34
* 10/16/98 attempting some multi-session support
* 10/17/98 added freespace count for "df"
* 11/11/98 gr added novrs option
* 11/26/98 dgb added fileset,anchor mount options
* 12/06/98 blf really hosed things royally. vat/sparing support. sequenced
* vol descs. rewrote option handling based on isofs
* 12/20/98 find the free space bitmap (if it exists)
*/
#include "udfdecl.h"
#include <linux/blkdev.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/stat.h>
#include <linux/cdrom.h>
#include <linux/nls.h>
#include <linux/vfs.h>
#include <linux/vmalloc.h>
#include <linux/errno.h>
#include <linux/seq_file.h>
#include <linux/bitmap.h>
#include <linux/crc-itu-t.h>
#include <linux/log2.h>
#include <asm/byteorder.h>
#include <linux/iversion.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include "udf_sb.h"
#include "udf_i.h"
#include <linux/init.h>
#include <linux/uaccess.h>
enum {
VDS_POS_PRIMARY_VOL_DESC,
VDS_POS_UNALLOC_SPACE_DESC,
VDS_POS_LOGICAL_VOL_DESC,
VDS_POS_IMP_USE_VOL_DESC,
VDS_POS_LENGTH
};
#define VSD_FIRST_SECTOR_OFFSET 32768
#define VSD_MAX_SECTOR_OFFSET 0x800000
/*
* Maximum number of Terminating Descriptor / Logical Volume Integrity
* Descriptor redirections. The chosen numbers are arbitrary - just that we
* hopefully don't limit any real use of rewritten inode on write-once media
* but avoid looping for too long on corrupted media.
*/
#define UDF_MAX_TD_NESTING 64
#define UDF_MAX_LVID_NESTING 1000
enum { UDF_MAX_LINKS = 0xffff };
/*
* We limit filesize to 4TB. This is arbitrary as the on-disk format supports
* more but because the file space is described by a linked list of extents,
* each of which can have at most 1GB, the creation and handling of extents
* gets unusably slow beyond certain point...
*/
#define UDF_MAX_FILESIZE (1ULL << 42)
/* These are the "meat" - everything else is stuffing */
static int udf_fill_super(struct super_block *sb, struct fs_context *fc);
static void udf_put_super(struct super_block *);
static int udf_sync_fs(struct super_block *, int);
static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
static void udf_open_lvid(struct super_block *);
static void udf_close_lvid(struct super_block *);
static unsigned int udf_count_free(struct super_block *);
static int udf_statfs(struct dentry *, struct kstatfs *);
static int udf_show_options(struct seq_file *, struct dentry *);
static int udf_init_fs_context(struct fs_context *fc);
static int udf_parse_param(struct fs_context *fc, struct fs_parameter *param);
static int udf_reconfigure(struct fs_context *fc);
static void udf_free_fc(struct fs_context *fc);
static const struct fs_parameter_spec udf_param_spec[];
struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
{
struct logicalVolIntegrityDesc *lvid;
unsigned int partnum;
unsigned int offset;
if (!UDF_SB(sb)->s_lvid_bh)
return NULL;
lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
partnum = le32_to_cpu(lvid->numOfPartitions);
/* The offset is to skip freeSpaceTable and sizeTable arrays */
offset = partnum * 2 * sizeof(uint32_t);
return (struct logicalVolIntegrityDescImpUse *)
(((uint8_t *)(lvid + 1)) + offset);
}
/* UDF filesystem type */
static int udf_get_tree(struct fs_context *fc)
{
return get_tree_bdev(fc, udf_fill_super);
}
static const struct fs_context_operations udf_context_ops = {
.parse_param = udf_parse_param,
.get_tree = udf_get_tree,
.reconfigure = udf_reconfigure,
.free = udf_free_fc,
};
static struct file_system_type udf_fstype = {
.owner = THIS_MODULE,
.name = "udf",
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
.init_fs_context = udf_init_fs_context,
.parameters = udf_param_spec,
};
MODULE_ALIAS_FS("udf");
static struct kmem_cache *udf_inode_cachep;
static struct inode *udf_alloc_inode(struct super_block *sb)
{
struct udf_inode_info *ei;
ei = alloc_inode_sb(sb, udf_inode_cachep, GFP_KERNEL);
if (!ei)
return NULL;
ei->i_unique = 0;
ei->i_lenExtents = 0;
ei->i_lenStreams = 0;
ei->i_next_alloc_block = 0;
ei->i_next_alloc_goal = 0;
ei->i_strat4096 = 0;
ei->i_streamdir = 0;
ei->i_hidden = 0;
init_rwsem(&ei->i_data_sem);
ei->cached_extent.lstart = -1;
spin_lock_init(&ei->i_extent_cache_lock);
inode_set_iversion(&ei->vfs_inode, 1);
return &ei->vfs_inode;
}
static void udf_free_in_core_inode(struct inode *inode)
{
kmem_cache_free(udf_inode_cachep, UDF_I(inode));
}
static void init_once(void *foo)
{
struct udf_inode_info *ei = foo;
ei->i_data = NULL;
inode_init_once(&ei->vfs_inode);
}
static int __init init_inodecache(void)
{
udf_inode_cachep = kmem_cache_create("udf_inode_cache",
sizeof(struct udf_inode_info),
0, (SLAB_RECLAIM_ACCOUNT |
SLAB_ACCOUNT),
init_once);
if (!udf_inode_cachep)
return -ENOMEM;
return 0;
}
static void destroy_inodecache(void)
{
/*
* Make sure all delayed rcu free inodes are flushed before we
* destroy cache.
*/
rcu_barrier();
kmem_cache_destroy(udf_inode_cachep);
}
/* Superblock operations */
static const struct super_operations udf_sb_ops = {
.alloc_inode = udf_alloc_inode,
.free_inode = udf_free_in_core_inode,
.write_inode = udf_write_inode,
.evict_inode = udf_evict_inode,
.put_super = udf_put_super,
.sync_fs = udf_sync_fs,
.statfs = udf_statfs,
.show_options = udf_show_options,
};
struct udf_options {
unsigned int blocksize;
unsigned int session;
unsigned int lastblock;
unsigned int anchor;
unsigned int flags;
umode_t umask;
kgid_t gid;
kuid_t uid;
umode_t fmode;
umode_t dmode;
struct nls_table *nls_map;
};
/*
* UDF has historically preserved prior mount options across
* a remount, so copy those here if remounting, otherwise set
* initial mount defaults.
*/
static void udf_init_options(struct fs_context *fc, struct udf_options *uopt)
{
if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
struct super_block *sb = fc->root->d_sb;
struct udf_sb_info *sbi = UDF_SB(sb);
uopt->flags = sbi->s_flags;
uopt->uid = sbi->s_uid;
uopt->gid = sbi->s_gid;
uopt->umask = sbi->s_umask;
uopt->fmode = sbi->s_fmode;
uopt->dmode = sbi->s_dmode;
uopt->nls_map = NULL;
} else {
uopt->flags = (1 << UDF_FLAG_USE_AD_IN_ICB) |
(1 << UDF_FLAG_STRICT);
/*
* By default we'll use overflow[ug]id when UDF
* inode [ug]id == -1
*/
uopt->uid = make_kuid(current_user_ns(), overflowuid);
uopt->gid = make_kgid(current_user_ns(), overflowgid);
uopt->umask = 0;
uopt->fmode = UDF_INVALID_MODE;
uopt->dmode = UDF_INVALID_MODE;
uopt->nls_map = NULL;
uopt->session = 0xFFFFFFFF;
}
}
static int udf_init_fs_context(struct fs_context *fc)
{
struct udf_options *uopt;
uopt = kzalloc(sizeof(*uopt), GFP_KERNEL);
if (!uopt)
return -ENOMEM;
udf_init_options(fc, uopt);
fc->fs_private = uopt;
fc->ops = &udf_context_ops;
return 0;
}
static void udf_free_fc(struct fs_context *fc)
{
struct udf_options *uopt = fc->fs_private;
unload_nls(uopt->nls_map);
kfree(fc->fs_private);
}
static int __init init_udf_fs(void)
{
int err;
err = init_inodecache();
if (err)
goto out1;
err = register_filesystem(&udf_fstype);
if (err)
goto out;
return 0;
out:
destroy_inodecache();
out1:
return err;
}
static void __exit exit_udf_fs(void)
{
unregister_filesystem(&udf_fstype);
destroy_inodecache();
}
static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count)
{
struct udf_sb_info *sbi = UDF_SB(sb);
sbi->s_partmaps = kcalloc(count, sizeof(*sbi->s_partmaps), GFP_KERNEL);
if (!sbi->s_partmaps) {
sbi->s_partitions = 0;
return -ENOMEM;
}
sbi->s_partitions = count;
return 0;
}
static void udf_sb_free_bitmap(struct udf_bitmap *bitmap)
{
int i;
int nr_groups = bitmap->s_nr_groups;
for (i = 0; i < nr_groups; i++)
if (!IS_ERR_OR_NULL(bitmap->s_block_bitmap[i]))
brelse(bitmap->s_block_bitmap[i]);
kvfree(bitmap);
}
static void udf_free_partition(struct udf_part_map *map)
{
int i;
struct udf_meta_data *mdata;
if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE)
iput(map->s_uspace.s_table);
if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP)
udf_sb_free_bitmap(map->s_uspace.s_bitmap);
if (map->s_partition_type == UDF_SPARABLE_MAP15)
for (i = 0; i < 4; i++)
brelse(map->s_type_specific.s_sparing.s_spar_map[i]);
else if (map->s_partition_type == UDF_METADATA_MAP25) {
mdata = &map->s_type_specific.s_metadata;
iput(mdata->s_metadata_fe);
mdata->s_metadata_fe = NULL;
iput(mdata->s_mirror_fe);
mdata->s_mirror_fe = NULL;
iput(mdata->s_bitmap_fe);
mdata->s_bitmap_fe = NULL;
}
}
static void udf_sb_free_partitions(struct super_block *sb)
{
struct udf_sb_info *sbi = UDF_SB(sb);
int i;
if (!sbi->s_partmaps)
return;
for (i = 0; i < sbi->s_partitions; i++)
udf_free_partition(&sbi->s_partmaps[i]);
kfree(sbi->s_partmaps);
sbi->s_partmaps = NULL;
}
static int udf_show_options(struct seq_file *seq, struct dentry *root)
{
struct super_block *sb = root->d_sb;
struct udf_sb_info *sbi = UDF_SB(sb);
if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
seq_puts(seq, ",nostrict");
if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET))
seq_printf(seq, ",bs=%lu", sb->s_blocksize);
if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
seq_puts(seq, ",unhide");
if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
seq_puts(seq, ",undelete");
if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB))
seq_puts(seq, ",noadinicb");
if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD))
seq_puts(seq, ",shortad");
if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET))
seq_puts(seq, ",uid=forget");
if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
seq_puts(seq, ",gid=forget");
if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->s_uid));
if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->s_gid));
if (sbi->s_umask != 0)
seq_printf(seq, ",umask=%ho", sbi->s_umask);
if (sbi->s_fmode != UDF_INVALID_MODE)
seq_printf(seq, ",mode=%ho", sbi->s_fmode);
if (sbi->s_dmode != UDF_INVALID_MODE)
seq_printf(seq, ",dmode=%ho", sbi->s_dmode);
if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET))
seq_printf(seq, ",session=%d", sbi->s_session);
if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET))
seq_printf(seq, ",lastblock=%u", sbi->s_last_block);
if (sbi->s_anchor != 0)
seq_printf(seq, ",anchor=%u", sbi->s_anchor);
if (sbi->s_nls_map)
seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
else
seq_puts(seq, ",iocharset=utf8");
return 0;
}
/*
* udf_parse_param
*
* PURPOSE
* Parse mount options.
*
* DESCRIPTION
* The following mount options are supported:
*
* gid= Set the default group.
* umask= Set the default umask.
* mode= Set the default file permissions.
* dmode= Set the default directory permissions.
* uid= Set the default user.
* bs= Set the block size.
* unhide Show otherwise hidden files.
* undelete Show deleted files in lists.
* adinicb Embed data in the inode (default)
* noadinicb Don't embed data in the inode
* shortad Use short ad's
* longad Use long ad's (default)
* nostrict Unset strict conformance
* iocharset= Set the NLS character set
*
* The remaining are for debugging and disaster recovery:
*
* novrs Skip volume sequence recognition
*
* The following expect a offset from 0.
*
* session= Set the CDROM session (default= last session)
* anchor= Override standard anchor location. (default= 256)
* volume= Override the VolumeDesc location. (unused)
* partition= Override the PartitionDesc location. (unused)
* lastblock= Set the last block of the filesystem/
*
* The following expect a offset from the partition root.
*
* fileset= Override the fileset block location. (unused)
* rootdir= Override the root directory location. (unused)
* WARNING: overriding the rootdir to a non-directory may
* yield highly unpredictable results.
*
* PRE-CONDITIONS
* fc fs_context with pointer to mount options variable.
* param Pointer to fs_parameter being parsed.
*
* POST-CONDITIONS
* <return> 0 Mount options parsed okay.
* <return> errno Error parsing mount options.
*
* HISTORY
* July 1, 1997 - Andrew E. Mileski
* Written, tested, and released.
*/
enum {
Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete,
Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad,
Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock,
Opt_anchor, Opt_volume, Opt_partition, Opt_fileset,
Opt_rootdir, Opt_utf8, Opt_iocharset, Opt_err, Opt_fmode, Opt_dmode
};
static const struct fs_parameter_spec udf_param_spec[] = {
fsparam_flag ("novrs", Opt_novrs),
fsparam_flag ("nostrict", Opt_nostrict),
fsparam_u32 ("bs", Opt_bs),
fsparam_flag ("unhide", Opt_unhide),
fsparam_flag ("undelete", Opt_undelete),
fsparam_flag_no ("adinicb", Opt_adinicb),
fsparam_flag ("shortad", Opt_shortad),
fsparam_flag ("longad", Opt_longad),
fsparam_string ("gid", Opt_gid),
fsparam_string ("uid", Opt_uid),
fsparam_u32 ("umask", Opt_umask),
fsparam_u32 ("session", Opt_session),
fsparam_u32 ("lastblock", Opt_lastblock),
fsparam_u32 ("anchor", Opt_anchor),
fsparam_u32 ("volume", Opt_volume),
fsparam_u32 ("partition", Opt_partition),
fsparam_u32 ("fileset", Opt_fileset),
fsparam_u32 ("rootdir", Opt_rootdir),
fsparam_flag ("utf8", Opt_utf8),
fsparam_string ("iocharset", Opt_iocharset),
fsparam_u32 ("mode", Opt_fmode),
fsparam_u32 ("dmode", Opt_dmode),
{}
};
static int udf_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
unsigned int uv;
unsigned int n;
struct udf_options *uopt = fc->fs_private;
struct fs_parse_result result;
int token;
bool remount = (fc->purpose & FS_CONTEXT_FOR_RECONFIGURE);
token = fs_parse(fc, udf_param_spec, param, &result);
if (token < 0)
return token;
switch (token) {
case Opt_novrs:
uopt->flags |= (1 << UDF_FLAG_NOVRS);
break;
case Opt_bs:
n = result.uint_32;
if (n != 512 && n != 1024 && n != 2048 && n != 4096)
return -EINVAL;
uopt->blocksize = n;
uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET);
break;
case Opt_unhide:
uopt->flags |= (1 << UDF_FLAG_UNHIDE);
break;
case Opt_undelete:
uopt->flags |= (1 << UDF_FLAG_UNDELETE);
break;
case Opt_adinicb:
if (result.negated)
uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
else
uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB);
break;
case Opt_shortad:
uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD);
break;
case Opt_longad:
uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD);
break;
case Opt_gid:
if (kstrtoint(param->string, 10, &uv) == 0) {
kgid_t gid = make_kgid(current_user_ns(), uv);
if (!gid_valid(gid))
return -EINVAL;
uopt->gid = gid;
uopt->flags |= (1 << UDF_FLAG_GID_SET);
} else if (!strcmp(param->string, "forget")) {
uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
} else if (!strcmp(param->string, "ignore")) {
/* this option is superseded by gid=<number> */
;
} else {
return -EINVAL;
}
break;
case Opt_uid:
if (kstrtoint(param->string, 10, &uv) == 0) {
kuid_t uid = make_kuid(current_user_ns(), uv);
if (!uid_valid(uid))
return -EINVAL;
uopt->uid = uid;
uopt->flags |= (1 << UDF_FLAG_UID_SET);
} else if (!strcmp(param->string, "forget")) {
uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
} else if (!strcmp(param->string, "ignore")) {
/* this option is superseded by uid=<number> */
;
} else {
return -EINVAL;
}
break;
case Opt_umask:
uopt->umask = result.uint_32;
break;
case Opt_nostrict:
uopt->flags &= ~(1 << UDF_FLAG_STRICT);
break;
case Opt_session:
uopt->session = result.uint_32;
if (!remount)
uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
break;
case Opt_lastblock:
uopt->lastblock = result.uint_32;
if (!remount)
uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
break;
case Opt_anchor:
uopt->anchor = result.uint_32;
break;
case Opt_volume:
case Opt_partition:
case Opt_fileset:
case Opt_rootdir:
/* Ignored (never implemented properly) */
break;
case Opt_utf8:
if (!remount) {
unload_nls(uopt->nls_map);
uopt->nls_map = NULL;
}
break;
case Opt_iocharset:
if (!remount) {
unload_nls(uopt->nls_map);
uopt->nls_map = NULL;
}
/* When nls_map is not loaded then UTF-8 is used */
if (!remount && strcmp(param->string, "utf8") != 0) {
uopt->nls_map = load_nls(param->string);
if (!uopt->nls_map) {
errorf(fc, "iocharset %s not found",
param->string);
return -EINVAL;
}
}
break;
case Opt_fmode:
uopt->fmode = result.uint_32 & 0777;
break;
case Opt_dmode:
uopt->dmode = result.uint_32 & 0777;
break;
default:
return -EINVAL;
}
return 0;
}
static int udf_reconfigure(struct fs_context *fc)
{
struct udf_options *uopt = fc->fs_private;
struct super_block *sb = fc->root->d_sb;
struct udf_sb_info *sbi = UDF_SB(sb);
int readonly = fc->sb_flags & SB_RDONLY;
int error = 0;
if (!readonly && UDF_QUERY_FLAG(sb, UDF_FLAG_RW_INCOMPAT))
return -EACCES;
sync_filesystem(sb);
write_lock(&sbi->s_cred_lock);
sbi->s_flags = uopt->flags;
sbi->s_uid = uopt->uid;
sbi->s_gid = uopt->gid;
sbi->s_umask = uopt->umask;
sbi->s_fmode = uopt->fmode;
sbi->s_dmode = uopt->dmode;
write_unlock(&sbi->s_cred_lock);
if (readonly == sb_rdonly(sb))
goto out_unlock;
if (readonly)
udf_close_lvid(sb);
else
udf_open_lvid(sb);
out_unlock:
return error;
}
/*
* Check VSD descriptor. Returns -1 in case we are at the end of volume
* recognition area, 0 if the descriptor is valid but non-interesting, 1 if
* we found one of NSR descriptors we are looking for.
*/
static int identify_vsd(const struct volStructDesc *vsd)
{
int ret = 0;
if (!memcmp(vsd->stdIdent, VSD_STD_ID_CD001, VSD_STD_ID_LEN)) {
switch (vsd->structType) {
case 0:
udf_debug("ISO9660 Boot Record found\n");
break;
case 1:
udf_debug("ISO9660 Primary Volume Descriptor found\n");
break;
case 2:
udf_debug("ISO9660 Supplementary Volume Descriptor found\n");
break;
case 3:
udf_debug("ISO9660 Volume Partition Descriptor found\n");
break;
case 255:
udf_debug("ISO9660 Volume Descriptor Set Terminator found\n");
break;
default:
udf_debug("ISO9660 VRS (%u) found\n", vsd->structType);
break;
}
} else if (!memcmp(vsd->stdIdent, VSD_STD_ID_BEA01, VSD_STD_ID_LEN))
; /* ret = 0 */
else if (!memcmp(vsd->stdIdent, VSD_STD_ID_NSR02, VSD_STD_ID_LEN))
ret = 1;
else if (!memcmp(vsd->stdIdent, VSD_STD_ID_NSR03, VSD_STD_ID_LEN))
ret = 1;
else if (!memcmp(vsd->stdIdent, VSD_STD_ID_BOOT2, VSD_STD_ID_LEN))
; /* ret = 0 */
else if (!memcmp(vsd->stdIdent, VSD_STD_ID_CDW02, VSD_STD_ID_LEN))
; /* ret = 0 */
else {
/* TEA01 or invalid id : end of volume recognition area */
ret = -1;
}
return ret;
}
/*
* Check Volume Structure Descriptors (ECMA 167 2/9.1)
* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1)
* @return 1 if NSR02 or NSR03 found,
* -1 if first sector read error, 0 otherwise
*/
static int udf_check_vsd(struct super_block *sb)
{
struct volStructDesc *vsd = NULL;
loff_t sector = VSD_FIRST_SECTOR_OFFSET;
int sectorsize;
struct buffer_head *bh = NULL;
int nsr = 0;
struct udf_sb_info *sbi;
loff_t session_offset;
sbi = UDF_SB(sb);
if (sb->s_blocksize < sizeof(struct volStructDesc))
sectorsize = sizeof(struct volStructDesc);
else
sectorsize = sb->s_blocksize;
session_offset = (loff_t)sbi->s_session << sb->s_blocksize_bits;
sector += session_offset;
udf_debug("Starting at sector %u (%lu byte sectors)\n",
(unsigned int)(sector >> sb->s_blocksize_bits),
sb->s_blocksize);
/* Process the sequence (if applicable). The hard limit on the sector
* offset is arbitrary, hopefully large enough so that all valid UDF
* filesystems will be recognised. There is no mention of an upper
* bound to the size of the volume recognition area in the standard.
* The limit will prevent the code to read all the sectors of a
* specially crafted image (like a bluray disc full of CD001 sectors),
* potentially causing minutes or even hours of uninterruptible I/O
* activity. This actually happened with uninitialised SSD partitions
* (all 0xFF) before the check for the limit and all valid IDs were
* added */
for (; !nsr && sector < VSD_MAX_SECTOR_OFFSET; sector += sectorsize) {
/* Read a block */
bh = sb_bread(sb, sector >> sb->s_blocksize_bits);
if (!bh)
break;
vsd = (struct volStructDesc *)(bh->b_data +
(sector & (sb->s_blocksize - 1)));
nsr = identify_vsd(vsd);
/* Found NSR or end? */
if (nsr) {
brelse(bh);
break;
}
/*
* Special handling for improperly formatted VRS (e.g., Win10)
* where components are separated by 2048 bytes even though
* sectors are 4K
*/
if (sb->s_blocksize == 4096) {
nsr = identify_vsd(vsd + 1);
/* Ignore unknown IDs... */
if (nsr < 0)
nsr = 0;
}
brelse(bh);
}
if (nsr > 0)
return 1;
else if (!bh && sector - session_offset == VSD_FIRST_SECTOR_OFFSET)
return -1;
else
return 0;
}
static int udf_verify_domain_identifier(struct super_block *sb,
struct regid *ident, char *dname)
{
struct domainIdentSuffix *suffix;
if (memcmp(ident->ident, UDF_ID_COMPLIANT, strlen(UDF_ID_COMPLIANT))) {
udf_warn(sb, "Not OSTA UDF compliant %s descriptor.\n", dname);
goto force_ro;
}
if (ident->flags & ENTITYID_FLAGS_DIRTY) {
udf_warn(sb, "Possibly not OSTA UDF compliant %s descriptor.\n",
dname);
goto force_ro;
}
suffix = (struct domainIdentSuffix *)ident->identSuffix;
if ((suffix->domainFlags & DOMAIN_FLAGS_HARD_WRITE_PROTECT) ||
(suffix->domainFlags & DOMAIN_FLAGS_SOFT_WRITE_PROTECT)) {
if (!sb_rdonly(sb)) {
udf_warn(sb, "Descriptor for %s marked write protected."
" Forcing read only mount.\n", dname);
}
goto force_ro;
}
return 0;
force_ro:
if (!sb_rdonly(sb))
return -EACCES;
UDF_SET_FLAG(sb, UDF_FLAG_RW_INCOMPAT);
return 0;
}
static int udf_load_fileset(struct super_block *sb, struct fileSetDesc *fset,
struct kernel_lb_addr *root)
{
int ret;
ret = udf_verify_domain_identifier(sb, &fset->domainIdent, "file set");
if (ret < 0)
return ret;
*root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
udf_debug("Rootdir at block=%u, partition=%u\n",
root->logicalBlockNum, root->partitionReferenceNum);
return 0;
}
static int udf_find_fileset(struct super_block *sb,
struct kernel_lb_addr *fileset,
struct kernel_lb_addr *root)
{
struct buffer_head *bh;
uint16_t ident;
int ret;
if (fileset->logicalBlockNum == 0xFFFFFFFF &&
fileset->partitionReferenceNum == 0xFFFF)
return -EINVAL;
bh = udf_read_ptagged(sb, fileset, 0, &ident);
if (!bh)
return -EIO;
if (ident != TAG_IDENT_FSD) {
brelse(bh);
return -EINVAL;
}
udf_debug("Fileset at block=%u, partition=%u\n",
fileset->logicalBlockNum, fileset->partitionReferenceNum);
UDF_SB(sb)->s_partition = fileset->partitionReferenceNum;
ret = udf_load_fileset(sb, (struct fileSetDesc *)bh->b_data, root);
brelse(bh);
return ret;
}
/*
* Load primary Volume Descriptor Sequence
*
* Return <0 on error, 0 on success. -EAGAIN is special meaning next sequence
* should be tried.
*/
static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
{
struct primaryVolDesc *pvoldesc;
uint8_t *outstr;
struct buffer_head *bh;
uint16_t ident;
int ret;
struct timestamp *ts;
outstr = kzalloc(128, GFP_KERNEL);
if (!outstr)
return -ENOMEM;
bh = udf_read_tagged(sb, block, block, &ident);
if (!bh) {
ret = -EAGAIN;
goto out2;
}
if (ident != TAG_IDENT_PVD) {
ret = -EIO;
goto out_bh;
}
pvoldesc = (struct primaryVolDesc *)bh->b_data;
udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
pvoldesc->recordingDateAndTime);
ts = &pvoldesc->recordingDateAndTime;
udf_debug("recording time %04u/%02u/%02u %02u:%02u (%x)\n",
le16_to_cpu(ts->year), ts->month, ts->day, ts->hour,
ts->minute, le16_to_cpu(ts->typeAndTimezone));
ret = udf_dstrCS0toChar(sb, outstr, 31, pvoldesc->volIdent, 32);
if (ret < 0) {
strscpy_pad(UDF_SB(sb)->s_volume_ident, "InvalidName");
pr_warn("incorrect volume identification, setting to "
"'InvalidName'\n");
} else {
strscpy_pad(UDF_SB(sb)->s_volume_ident, outstr);
}
udf_debug("volIdent[] = '%s'\n", UDF_SB(sb)->s_volume_ident);
ret = udf_dstrCS0toChar(sb, outstr, 127, pvoldesc->volSetIdent, 128);
if (ret < 0) {
ret = 0;
goto out_bh;
}
outstr[ret] = 0;
udf_debug("volSetIdent[] = '%s'\n", outstr);
ret = 0;
out_bh:
brelse(bh);
out2:
kfree(outstr);
return ret;
}
struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
u32 meta_file_loc, u32 partition_ref)
{
struct kernel_lb_addr addr;
struct inode *metadata_fe;
addr.logicalBlockNum = meta_file_loc;
addr.partitionReferenceNum = partition_ref;
metadata_fe = udf_iget_special(sb, &addr);
if (IS_ERR(metadata_fe)) {
udf_warn(sb, "metadata inode efe not found\n");
return metadata_fe;
}
if (UDF_I(metadata_fe)->i_alloc_type != ICBTAG_FLAG_AD_SHORT) {
udf_warn(sb, "metadata inode efe does not have short allocation descriptors!\n");
iput(metadata_fe);
return ERR_PTR(-EIO);
}
return metadata_fe;
}
static int udf_load_metadata_files(struct super_block *sb, int partition,
int type1_index)
{
struct udf_sb_info *sbi = UDF_SB(sb);
struct udf_part_map *map;
struct udf_meta_data *mdata;
struct kernel_lb_addr addr;
struct inode *fe;
map = &sbi->s_partmaps[partition];
mdata = &map->s_type_specific.s_metadata;
mdata->s_phys_partition_ref = type1_index;
/* metadata address */
udf_debug("Metadata file location: block = %u part = %u\n",
mdata->s_meta_file_loc, mdata->s_phys_partition_ref);
fe = udf_find_metadata_inode_efe(sb, mdata->s_meta_file_loc,
mdata->s_phys_partition_ref);
if (IS_ERR(fe)) {
/* mirror file entry */
udf_debug("Mirror metadata file location: block = %u part = %u\n",
mdata->s_mirror_file_loc, mdata->s_phys_partition_ref);
fe = udf_find_metadata_inode_efe(sb, mdata->s_mirror_file_loc,
mdata->s_phys_partition_ref);
if (IS_ERR(fe)) {