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linux/fs/udf/super.c
Jan Kara 57b9655d01 udf: Improve table length check to avoid possible overflow 
When a partition table length is corrupted to be close to 1 << 32, the
check for its length may overflow on 32-bit systems and we will think
the length is valid. Later on the kernel can crash trying to read beyond
end of buffer. Fix the check to avoid possible overflow.

CC: stable@vger.kernel.org
Reported-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Jan Kara <jack@suse.cz>
2012-07-10 18:02:17 +02:00

2321 lines
61 KiB
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/*
* 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/
* http://www.ecma.ch/
* http://www.iso.org/
*
* COPYRIGHT
* This file is distributed under the terms of the GNU General Public
* License (GPL). Copies of the GPL can be obtained from:
* ftp://prep.ai.mit.edu/pub/gnu/GPL
* Each contributing author retains all rights to their own work.
*
* (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/parser.h>
#include <linux/stat.h>
#include <linux/cdrom.h>
#include <linux/nls.h>
#include <linux/buffer_head.h>
#include <linux/vfs.h>
#include <linux/vmalloc.h>
#include <linux/errno.h>
#include <linux/mount.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 "udf_sb.h"
#include "udf_i.h"
#include <linux/init.h>
#include <asm/uaccess.h>
#define VDS_POS_PRIMARY_VOL_DESC 0
#define VDS_POS_UNALLOC_SPACE_DESC 1
#define VDS_POS_LOGICAL_VOL_DESC 2
#define VDS_POS_PARTITION_DESC 3
#define VDS_POS_IMP_USE_VOL_DESC 4
#define VDS_POS_VOL_DESC_PTR 5
#define VDS_POS_TERMINATING_DESC 6
#define VDS_POS_LENGTH 7
#define UDF_DEFAULT_BLOCKSIZE 2048
enum { UDF_MAX_LINKS = 0xffff };
/* These are the "meat" - everything else is stuffing */
static int udf_fill_super(struct super_block *, void *, int);
static void udf_put_super(struct super_block *);
static int udf_sync_fs(struct super_block *, int);
static int udf_remount_fs(struct super_block *, int *, char *);
static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad);
static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *,
struct kernel_lb_addr *);
static void udf_load_fileset(struct super_block *, struct buffer_head *,
struct kernel_lb_addr *);
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 *);
struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi)
{
struct logicalVolIntegrityDesc *lvid =
(struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
__u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions);
__u32 offset = number_of_partitions * 2 *
sizeof(uint32_t)/sizeof(uint8_t);
return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
}
/* UDF filesystem type */
static struct dentry *udf_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
return mount_bdev(fs_type, flags, dev_name, data, udf_fill_super);
}
static struct file_system_type udf_fstype = {
.owner = THIS_MODULE,
.name = "udf",
.mount = udf_mount,
.kill_sb = kill_block_super,
.fs_flags = FS_REQUIRES_DEV,
};
static struct kmem_cache *udf_inode_cachep;
static struct inode *udf_alloc_inode(struct super_block *sb)
{
struct udf_inode_info *ei;
ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL);
if (!ei)
return NULL;
ei->i_unique = 0;
ei->i_lenExtents = 0;
ei->i_next_alloc_block = 0;
ei->i_next_alloc_goal = 0;
ei->i_strat4096 = 0;
init_rwsem(&ei->i_data_sem);
return &ei->vfs_inode;
}
static void udf_i_callback(struct rcu_head *head)
{
struct inode *inode = container_of(head, struct inode, i_rcu);
kmem_cache_free(udf_inode_cachep, UDF_I(inode));
}
static void udf_destroy_inode(struct inode *inode)
{
call_rcu(&inode->i_rcu, udf_i_callback);
}
static void init_once(void *foo)
{
struct udf_inode_info *ei = (struct udf_inode_info *)foo;
ei->i_ext.i_data = NULL;
inode_init_once(&ei->vfs_inode);
}
static int init_inodecache(void)
{
udf_inode_cachep = kmem_cache_create("udf_inode_cache",
sizeof(struct udf_inode_info),
0, (SLAB_RECLAIM_ACCOUNT |
SLAB_MEM_SPREAD),
init_once);
if (!udf_inode_cachep)
return -ENOMEM;
return 0;
}
static void destroy_inodecache(void)
{
kmem_cache_destroy(udf_inode_cachep);
}
/* Superblock operations */
static const struct super_operations udf_sb_ops = {
.alloc_inode = udf_alloc_inode,
.destroy_inode = udf_destroy_inode,
.write_inode = udf_write_inode,
.evict_inode = udf_evict_inode,
.put_super = udf_put_super,
.sync_fs = udf_sync_fs,
.statfs = udf_statfs,
.remount_fs = udf_remount_fs,
.show_options = udf_show_options,
};
struct udf_options {
unsigned char novrs;
unsigned int blocksize;
unsigned int session;
unsigned int lastblock;
unsigned int anchor;
unsigned int volume;
unsigned short partition;
unsigned int fileset;
unsigned int rootdir;
unsigned int flags;
umode_t umask;
gid_t gid;
uid_t uid;
umode_t fmode;
umode_t dmode;
struct nls_table *nls_map;
};
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();
}
module_init(init_udf_fs)
module_exit(exit_udf_fs)
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(struct udf_part_map),
GFP_KERNEL);
if (!sbi->s_partmaps) {
udf_err(sb, "Unable to allocate space for %d partition maps\n",
count);
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;
int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) *
nr_groups);
for (i = 0; i < nr_groups; i++)
if (bitmap->s_block_bitmap[i])
brelse(bitmap->s_block_bitmap[i]);
if (size <= PAGE_SIZE)
kfree(bitmap);
else
vfree(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_FREED_TABLE)
iput(map->s_fspace.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_flags & UDF_PART_FLAG_FREED_BITMAP)
udf_sb_free_bitmap(map->s_fspace.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;
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_UID_IGNORE))
seq_puts(seq, ",uid=ignore");
if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET))
seq_puts(seq, ",gid=forget");
if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE))
seq_puts(seq, ",gid=ignore");
if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
seq_printf(seq, ",uid=%u", sbi->s_uid);
if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
seq_printf(seq, ",gid=%u", 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=%u", 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);
/*
* volume, partition, fileset and rootdir seem to be ignored
* currently
*/
if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
seq_puts(seq, ",utf8");
if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map)
seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset);
return 0;
}
/*
* udf_parse_options
*
* 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
* options Pointer to mount options string.
* uopts Pointer to mount options variable.
*
* POST-CONDITIONS
* <return> 1 Mount options parsed okay.
* <return> 0 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_uforget, Opt_uignore, Opt_gforget, Opt_gignore,
Opt_fmode, Opt_dmode
};
static const match_table_t tokens = {
{Opt_novrs, "novrs"},
{Opt_nostrict, "nostrict"},
{Opt_bs, "bs=%u"},
{Opt_unhide, "unhide"},
{Opt_undelete, "undelete"},
{Opt_noadinicb, "noadinicb"},
{Opt_adinicb, "adinicb"},
{Opt_shortad, "shortad"},
{Opt_longad, "longad"},
{Opt_uforget, "uid=forget"},
{Opt_uignore, "uid=ignore"},
{Opt_gforget, "gid=forget"},
{Opt_gignore, "gid=ignore"},
{Opt_gid, "gid=%u"},
{Opt_uid, "uid=%u"},
{Opt_umask, "umask=%o"},
{Opt_session, "session=%u"},
{Opt_lastblock, "lastblock=%u"},
{Opt_anchor, "anchor=%u"},
{Opt_volume, "volume=%u"},
{Opt_partition, "partition=%u"},
{Opt_fileset, "fileset=%u"},
{Opt_rootdir, "rootdir=%u"},
{Opt_utf8, "utf8"},
{Opt_iocharset, "iocharset=%s"},
{Opt_fmode, "mode=%o"},
{Opt_dmode, "dmode=%o"},
{Opt_err, NULL}
};
static int udf_parse_options(char *options, struct udf_options *uopt,
bool remount)
{
char *p;
int option;
uopt->novrs = 0;
uopt->partition = 0xFFFF;
uopt->session = 0xFFFFFFFF;
uopt->lastblock = 0;
uopt->anchor = 0;
uopt->volume = 0xFFFFFFFF;
uopt->rootdir = 0xFFFFFFFF;
uopt->fileset = 0xFFFFFFFF;
uopt->nls_map = NULL;
if (!options)
return 1;
while ((p = strsep(&options, ",")) != NULL) {
substring_t args[MAX_OPT_ARGS];
int token;
if (!*p)
continue;
token = match_token(p, tokens, args);
switch (token) {
case Opt_novrs:
uopt->novrs = 1;
break;
case Opt_bs:
if (match_int(&args[0], &option))
return 0;
uopt->blocksize = option;
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_noadinicb:
uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB);
break;
case Opt_adinicb:
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 (match_int(args, &option))
return 0;
uopt->gid = option;
uopt->flags |= (1 << UDF_FLAG_GID_SET);
break;
case Opt_uid:
if (match_int(args, &option))
return 0;
uopt->uid = option;
uopt->flags |= (1 << UDF_FLAG_UID_SET);
break;
case Opt_umask:
if (match_octal(args, &option))
return 0;
uopt->umask = option;
break;
case Opt_nostrict:
uopt->flags &= ~(1 << UDF_FLAG_STRICT);
break;
case Opt_session:
if (match_int(args, &option))
return 0;
uopt->session = option;
if (!remount)
uopt->flags |= (1 << UDF_FLAG_SESSION_SET);
break;
case Opt_lastblock:
if (match_int(args, &option))
return 0;
uopt->lastblock = option;
if (!remount)
uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET);
break;
case Opt_anchor:
if (match_int(args, &option))
return 0;
uopt->anchor = option;
break;
case Opt_volume:
if (match_int(args, &option))
return 0;
uopt->volume = option;
break;
case Opt_partition:
if (match_int(args, &option))
return 0;
uopt->partition = option;
break;
case Opt_fileset:
if (match_int(args, &option))
return 0;
uopt->fileset = option;
break;
case Opt_rootdir:
if (match_int(args, &option))
return 0;
uopt->rootdir = option;
break;
case Opt_utf8:
uopt->flags |= (1 << UDF_FLAG_UTF8);
break;
#ifdef CONFIG_UDF_NLS
case Opt_iocharset:
uopt->nls_map = load_nls(args[0].from);
uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
break;
#endif
case Opt_uignore:
uopt->flags |= (1 << UDF_FLAG_UID_IGNORE);
break;
case Opt_uforget:
uopt->flags |= (1 << UDF_FLAG_UID_FORGET);
break;
case Opt_gignore:
uopt->flags |= (1 << UDF_FLAG_GID_IGNORE);
break;
case Opt_gforget:
uopt->flags |= (1 << UDF_FLAG_GID_FORGET);
break;
case Opt_fmode:
if (match_octal(args, &option))
return 0;
uopt->fmode = option & 0777;
break;
case Opt_dmode:
if (match_octal(args, &option))
return 0;
uopt->dmode = option & 0777;
break;
default:
pr_err("bad mount option \"%s\" or missing value\n", p);
return 0;
}
}
return 1;
}
static int udf_remount_fs(struct super_block *sb, int *flags, char *options)
{
struct udf_options uopt;
struct udf_sb_info *sbi = UDF_SB(sb);
int error = 0;
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;
if (!udf_parse_options(options, &uopt, true))
return -EINVAL;
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 (sbi->s_lvid_bh) {
int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev);
if (write_rev > UDF_MAX_WRITE_VERSION)
*flags |= MS_RDONLY;
}
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
goto out_unlock;
if (*flags & MS_RDONLY)
udf_close_lvid(sb);
else
udf_open_lvid(sb);
out_unlock:
return error;
}
/* Check Volume Structure Descriptors (ECMA 167 2/9.1) */
/* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */
static loff_t udf_check_vsd(struct super_block *sb)
{
struct volStructDesc *vsd = NULL;
loff_t sector = 32768;
int sectorsize;
struct buffer_head *bh = NULL;
int nsr02 = 0;
int nsr03 = 0;
struct udf_sb_info *sbi;
sbi = UDF_SB(sb);
if (sb->s_blocksize < sizeof(struct volStructDesc))
sectorsize = sizeof(struct volStructDesc);
else
sectorsize = sb->s_blocksize;
sector += (sbi->s_session << sb->s_blocksize_bits);
udf_debug("Starting at sector %u (%ld byte sectors)\n",
(unsigned int)(sector >> sb->s_blocksize_bits),
sb->s_blocksize);
/* Process the sequence (if applicable) */
for (; !nsr02 && !nsr03; sector += sectorsize) {
/* Read a block */
bh = udf_tread(sb, sector >> sb->s_blocksize_bits);
if (!bh)
break;
/* Look for ISO descriptors */
vsd = (struct volStructDesc *)(bh->b_data +
(sector & (sb->s_blocksize - 1)));
if (vsd->stdIdent[0] == 0) {
brelse(bh);
break;
} else if (!strncmp(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 (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01,
VSD_STD_ID_LEN))
; /* nothing */
else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01,
VSD_STD_ID_LEN)) {
brelse(bh);
break;
} else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02,
VSD_STD_ID_LEN))
nsr02 = sector;
else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03,
VSD_STD_ID_LEN))
nsr03 = sector;
brelse(bh);
}
if (nsr03)
return nsr03;
else if (nsr02)
return nsr02;
else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768)
return -1;
else
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 = NULL;
long lastblock;
uint16_t ident;
struct udf_sb_info *sbi;
if (fileset->logicalBlockNum != 0xFFFFFFFF ||
fileset->partitionReferenceNum != 0xFFFF) {
bh = udf_read_ptagged(sb, fileset, 0, &ident);
if (!bh) {
return 1;
} else if (ident != TAG_IDENT_FSD) {
brelse(bh);
return 1;
}
}
sbi = UDF_SB(sb);
if (!bh) {
/* Search backwards through the partitions */
struct kernel_lb_addr newfileset;
/* --> cvg: FIXME - is it reasonable? */
return 1;
for (newfileset.partitionReferenceNum = sbi->s_partitions - 1;
(newfileset.partitionReferenceNum != 0xFFFF &&
fileset->logicalBlockNum == 0xFFFFFFFF &&
fileset->partitionReferenceNum == 0xFFFF);
newfileset.partitionReferenceNum--) {
lastblock = sbi->s_partmaps
[newfileset.partitionReferenceNum]
.s_partition_len;
newfileset.logicalBlockNum = 0;
do {
bh = udf_read_ptagged(sb, &newfileset, 0,
&ident);
if (!bh) {
newfileset.logicalBlockNum++;
continue;
}
switch (ident) {
case TAG_IDENT_SBD:
{
struct spaceBitmapDesc *sp;
sp = (struct spaceBitmapDesc *)
bh->b_data;
newfileset.logicalBlockNum += 1 +
((le32_to_cpu(sp->numOfBytes) +
sizeof(struct spaceBitmapDesc)
- 1) >> sb->s_blocksize_bits);
brelse(bh);
break;
}
case TAG_IDENT_FSD:
*fileset = newfileset;
break;
default:
newfileset.logicalBlockNum++;
brelse(bh);
bh = NULL;
break;
}
} while (newfileset.logicalBlockNum < lastblock &&
fileset->logicalBlockNum == 0xFFFFFFFF &&
fileset->partitionReferenceNum == 0xFFFF);
}
}
if ((fileset->logicalBlockNum != 0xFFFFFFFF ||
fileset->partitionReferenceNum != 0xFFFF) && bh) {
udf_debug("Fileset at block=%d, partition=%d\n",
fileset->logicalBlockNum,
fileset->partitionReferenceNum);
sbi->s_partition = fileset->partitionReferenceNum;
udf_load_fileset(sb, bh, root);
brelse(bh);
return 0;
}
return 1;
}
static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
{
struct primaryVolDesc *pvoldesc;
struct ustr *instr, *outstr;
struct buffer_head *bh;
uint16_t ident;
int ret = 1;
instr = kmalloc(sizeof(struct ustr), GFP_NOFS);
if (!instr)
return 1;
outstr = kmalloc(sizeof(struct ustr), GFP_NOFS);
if (!outstr)
goto out1;
bh = udf_read_tagged(sb, block, block, &ident);
if (!bh)
goto out2;
BUG_ON(ident != TAG_IDENT_PVD);
pvoldesc = (struct primaryVolDesc *)bh->b_data;
if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time,
pvoldesc->recordingDateAndTime)) {
#ifdef UDFFS_DEBUG
struct timestamp *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));
#endif
}
if (!udf_build_ustr(instr, pvoldesc->volIdent, 32))
if (udf_CS0toUTF8(outstr, instr)) {
strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name,
outstr->u_len > 31 ? 31 : outstr->u_len);
udf_debug("volIdent[] = '%s'\n",
UDF_SB(sb)->s_volume_ident);
}
if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128))
if (udf_CS0toUTF8(outstr, instr))
udf_debug("volSetIdent[] = '%s'\n", outstr->u_name);
brelse(bh);
ret = 0;
out2:
kfree(outstr);
out1:
kfree(instr);
return ret;
}
struct inode *udf_find_metadata_inode_efe(struct super_block *sb,
u32 meta_file_loc, u32 partition_num)
{
struct kernel_lb_addr addr;
struct inode *metadata_fe;
addr.logicalBlockNum = meta_file_loc;
addr.partitionReferenceNum = partition_num;
metadata_fe = udf_iget(sb, &addr);
if (metadata_fe == NULL)
udf_warn(sb, "metadata inode efe not found\n");
else 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);
metadata_fe = NULL;
}
return metadata_fe;
}
static int udf_load_metadata_files(struct super_block *sb, int partition)
{
struct udf_sb_info *sbi = UDF_SB(sb);
struct udf_part_map *map;
struct udf_meta_data *mdata;
struct kernel_lb_addr addr;
map = &sbi->s_partmaps[partition];
mdata = &map->s_type_specific.s_metadata;
/* metadata address */
udf_debug("Metadata file location: block = %d part = %d\n",
mdata->s_meta_file_loc, map->s_partition_num);
mdata->s_metadata_fe = udf_find_metadata_inode_efe(sb,
mdata->s_meta_file_loc, map->s_partition_num);
if (mdata->s_metadata_fe == NULL) {
/* mirror file entry */
udf_debug("Mirror metadata file location: block = %d part = %d\n",
mdata->s_mirror_file_loc, map->s_partition_num);
mdata->s_mirror_fe = udf_find_metadata_inode_efe(sb,
mdata->s_mirror_file_loc, map->s_partition_num);
if (mdata->s_mirror_fe == NULL) {
udf_err(sb, "Both metadata and mirror metadata inode efe can not found\n");
goto error_exit;
}
}
/*
* bitmap file entry
* Note:
* Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102)
*/
if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) {
addr.logicalBlockNum = mdata->s_bitmap_file_loc;
addr.partitionReferenceNum = map->s_partition_num;
udf_debug("Bitmap file location: block = %d part = %d\n",
addr.logicalBlockNum, addr.partitionReferenceNum);
mdata->s_bitmap_fe = udf_iget(sb, &addr);
if (mdata->s_bitmap_fe == NULL) {
if (sb->s_flags & MS_RDONLY)
udf_warn(sb, "bitmap inode efe not found but it's ok since the disc is mounted read-only\n");
else {
udf_err(sb, "bitmap inode efe not found and attempted read-write mount\n");
goto error_exit;
}
}
}
udf_debug("udf_load_metadata_files Ok\n");
return 0;
error_exit:
return 1;
}
static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
struct kernel_lb_addr *root)
{
struct fileSetDesc *fset;
fset = (struct fileSetDesc *)bh->b_data;
*root = lelb_to_cpu(fset->rootDirectoryICB.extLocation);
UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum);
udf_debug("Rootdir at block=%d, partition=%d\n",
root->logicalBlockNum, root->partitionReferenceNum);
}
int udf_compute_nr_groups(struct super_block *sb, u32 partition)
{
struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition];
return DIV_ROUND_UP(map->s_partition_len +
(sizeof(struct spaceBitmapDesc) << 3),
sb->s_blocksize * 8);
}
static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
{
struct udf_bitmap *bitmap;
int nr_groups;
int size;
nr_groups = udf_compute_nr_groups(sb, index);
size = sizeof(struct udf_bitmap) +
(sizeof(struct buffer_head *) * nr_groups);
if (size <= PAGE_SIZE)
bitmap = kzalloc(size, GFP_KERNEL);
else
bitmap = vzalloc(size); /* TODO: get rid of vzalloc */
if (bitmap == NULL)
return NULL;
bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
bitmap->s_nr_groups = nr_groups;
return bitmap;
}
static int udf_fill_partdesc_info(struct super_block *sb,
struct partitionDesc *p, int p_index)
{
struct udf_part_map *map;
struct udf_sb_info *sbi = UDF_SB(sb);
struct partitionHeaderDesc *phd;
map = &sbi->s_partmaps[p_index];
map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
map->s_partition_root = le32_to_cpu(p->partitionStartingLocation);
if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY))
map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY;
if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE))
map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE;
if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE))
map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE;
if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE))
map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE;
udf_debug("Partition (%d type %x) starts at physical %d, block length %d\n",
p_index, map->s_partition_type,
map->s_partition_root, map->s_partition_len);
if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
return 0;
phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
if (phd->unallocSpaceTable.extLength) {
struct kernel_lb_addr loc = {
.logicalBlockNum = le32_to_cpu(
phd->unallocSpaceTable.extPosition),
.partitionReferenceNum = p_index,
};
map->s_uspace.s_table = udf_iget(sb, &loc);
if (!map->s_uspace.s_table) {
udf_debug("cannot load unallocSpaceTable (part %d)\n",
p_index);
return 1;
}
map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
udf_debug("unallocSpaceTable (part %d) @ %ld\n",
p_index, map->s_uspace.s_table->i_ino);
}
if (phd->unallocSpaceBitmap.extLength) {
struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
if (!bitmap)
return 1;
map->s_uspace.s_bitmap = bitmap;
bitmap->s_extLength = le32_to_cpu(
phd->unallocSpaceBitmap.extLength);
bitmap->s_extPosition = le32_to_cpu(
phd->unallocSpaceBitmap.extPosition);
map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP;
udf_debug("unallocSpaceBitmap (part %d) @ %d\n",
p_index, bitmap->s_extPosition);
}
if (phd->partitionIntegrityTable.extLength)
udf_debug("partitionIntegrityTable (part %d)\n", p_index);
if (phd->freedSpaceTable.extLength) {
struct kernel_lb_addr loc = {
.logicalBlockNum = le32_to_cpu(
phd->freedSpaceTable.extPosition),
.partitionReferenceNum = p_index,
};
map->s_fspace.s_table = udf_iget(sb, &loc);
if (!map->s_fspace.s_table) {
udf_debug("cannot load freedSpaceTable (part %d)\n",
p_index);
return 1;
}
map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
udf_debug("freedSpaceTable (part %d) @ %ld\n",
p_index, map->s_fspace.s_table->i_ino);
}
if (phd->freedSpaceBitmap.extLength) {
struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index);
if (!bitmap)
return 1;
map->s_fspace.s_bitmap = bitmap;
bitmap->s_extLength = le32_to_cpu(
phd->freedSpaceBitmap.extLength);
bitmap->s_extPosition = le32_to_cpu(
phd->freedSpaceBitmap.extPosition);
map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP;
udf_debug("freedSpaceBitmap (part %d) @ %d\n",
p_index, bitmap->s_extPosition);
}
return 0;
}
static void udf_find_vat_block(struct super_block *sb, int p_index,
int type1_index, sector_t start_block)
{
struct udf_sb_info *sbi = UDF_SB(sb);
struct udf_part_map *map = &sbi->s_partmaps[p_index];
sector_t vat_block;
struct kernel_lb_addr ino;
/*
* VAT file entry is in the last recorded block. Some broken disks have
* it a few blocks before so try a bit harder...
*/
ino.partitionReferenceNum = type1_index;
for (vat_block = start_block;
vat_block >= map->s_partition_root &&
vat_block >= start_block - 3 &&
!sbi->s_vat_inode; vat_block--) {
ino.logicalBlockNum = vat_block - map->s_partition_root;
sbi->s_vat_inode = udf_iget(sb, &ino);
}
}
static int udf_load_vat(struct super_block *sb, int p_index, int type1_index)
{
struct udf_sb_info *sbi = UDF_SB(sb);
struct udf_part_map *map = &sbi->s_partmaps[p_index];
struct buffer_head *bh = NULL;
struct udf_inode_info *vati;
uint32_t pos;
struct virtualAllocationTable20 *vat20;
sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
udf_find_vat_block(sb, p_index, type1_index, sbi->s_last_block);
if (!sbi->s_vat_inode &&
sbi->s_last_block != blocks - 1) {
pr_notice("Failed to read VAT inode from the last recorded block (%lu), retrying with the last block of the device (%lu).\n",
(unsigned long)sbi->s_last_block,
(unsigned long)blocks - 1);
udf_find_vat_block(sb, p_index, type1_index, blocks - 1);
}
if (!sbi->s_vat_inode)
return 1;
if (map->s_partition_type == UDF_VIRTUAL_MAP15) {
map->s_type_specific.s_virtual.s_start_offset = 0;
map->s_type_specific.s_virtual.s_num_entries =
(sbi->s_vat_inode->i_size - 36) >> 2;
} else if (map->s_partition_type == UDF_VIRTUAL_MAP20) {
vati = UDF_I(sbi->s_vat_inode);
if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
pos = udf_block_map(sbi->s_vat_inode, 0);
bh = sb_bread(sb, pos);
if (!bh)
return 1;
vat20 = (struct virtualAllocationTable20 *)bh->b_data;
} else {
vat20 = (struct virtualAllocationTable20 *)
vati->i_ext.i_data;
}
map->s_type_specific.s_virtual.s_start_offset =
le16_to_cpu(vat20->lengthHeader);
map->s_type_specific.s_virtual.s_num_entries =
(sbi->s_vat_inode->i_size -
map->s_type_specific.s_virtual.
s_start_offset) >> 2;
brelse(bh);
}
return 0;
}
static int udf_load_partdesc(struct super_block *sb, sector_t block)
{
struct buffer_head *bh;
struct partitionDesc *p;
struct udf_part_map *map;
struct udf_sb_info *sbi = UDF_SB(sb);
int i, type1_idx;
uint16_t partitionNumber;
uint16_t ident;
int ret = 0;
bh = udf_read_tagged(sb, block, block, &ident);
if (!bh)
return 1;
if (ident != TAG_IDENT_PD)
goto out_bh;
p = (struct partitionDesc *)bh->b_data;
partitionNumber = le16_to_cpu(p->partitionNumber);
/* First scan for TYPE1, SPARABLE and METADATA partitions */
for (i = 0; i < sbi->s_partitions; i++) {
map = &sbi->s_partmaps[i];
udf_debug("Searching map: (%d == %d)\n",
map->s_partition_num, partitionNumber);
if (map->s_partition_num == partitionNumber &&
(map->s_partition_type == UDF_TYPE1_MAP15 ||
map->s_partition_type == UDF_SPARABLE_MAP15))
break;
}
if (i >= sbi->s_partitions) {
udf_debug("Partition (%d) not found in partition map\n",
partitionNumber);
goto out_bh;
}
ret = udf_fill_partdesc_info(sb, p, i);
/*
* Now rescan for VIRTUAL or METADATA partitions when SPARABLE and
* PHYSICAL partitions are already set up
*/
type1_idx = i;
for (i = 0; i < sbi->s_partitions; i++) {
map = &sbi->s_partmaps[i];
if (map->s_partition_num == partitionNumber &&
(map->s_partition_type == UDF_VIRTUAL_MAP15 ||
map->s_partition_type == UDF_VIRTUAL_MAP20 ||
map->s_partition_type == UDF_METADATA_MAP25))
break;
}
if (i >= sbi->s_partitions)
goto out_bh;
ret = udf_fill_partdesc_info(sb, p, i);
if (ret)
goto out_bh;
if (map->s_partition_type == UDF_METADATA_MAP25) {
ret = udf_load_metadata_files(sb, i);
if (ret) {
udf_err(sb, "error loading MetaData partition map %d\n",
i);
goto out_bh;
}
} else {
ret = udf_load_vat(sb, i, type1_idx);
if (ret)
goto out_bh;
/*
* Mark filesystem read-only if we have a partition with
* virtual map since we don't handle writing to it (we
* overwrite blocks instead of relocating them).
*/
sb->s_flags |= MS_RDONLY;
pr_notice("Filesystem marked read-only because writing to pseudooverwrite partition is not implemented\n");
}
out_bh:
/* In case loading failed, we handle cleanup in udf_fill_super */
brelse(bh);
return ret;
}
static int udf_load_sparable_map(struct super_block *sb,
struct udf_part_map *map,
struct sparablePartitionMap *spm)
{
uint32_t loc;
uint16_t ident;
struct sparingTable *st;
struct udf_sparing_data *sdata = &map->s_type_specific.s_sparing;
int i;
struct buffer_head *bh;
map->s_partition_type = UDF_SPARABLE_MAP15;
sdata->s_packet_len = le16_to_cpu(spm->packetLength);
if (!is_power_of_2(sdata->s_packet_len)) {
udf_err(sb, "error loading logical volume descriptor: "
"Invalid packet length %u\n",
(unsigned)sdata->s_packet_len);
return -EIO;
}
if (spm->numSparingTables > 4) {
udf_err(sb, "error loading logical volume descriptor: "
"Too many sparing tables (%d)\n",
(int)spm->numSparingTables);
return -EIO;
}
for (i = 0; i < spm->numSparingTables; i++) {
loc = le32_to_cpu(spm->locSparingTable[i]);
bh = udf_read_tagged(sb, loc, loc, &ident);
if (!bh)
continue;
st = (struct sparingTable *)bh->b_data;
if (ident != 0 ||
strncmp(st->sparingIdent.ident, UDF_ID_SPARING,
strlen(UDF_ID_SPARING)) ||
sizeof(*st) + le16_to_cpu(st->reallocationTableLen) >
sb->s_blocksize) {
brelse(bh);
continue;
}
sdata->s_spar_map[i] = bh;
}
map->s_partition_func = udf_get_pblock_spar15;
return 0;
}
static int udf_load_logicalvol(struct super_block *sb, sector_t block,
struct kernel_lb_addr *fileset)
{
struct logicalVolDesc *lvd;
int i, offset;
uint8_t type;
struct udf_sb_info *sbi = UDF_SB(sb);
struct genericPartitionMap *gpm;
uint16_t ident;
struct buffer_head *bh;
unsigned int table_len;
int ret = 0;
bh = udf_read_tagged(sb, block, block, &ident);
if (!bh)
return 1;
BUG_ON(ident != TAG_IDENT_LVD);
lvd = (struct logicalVolDesc *)bh->b_data;
table_len = le32_to_cpu(lvd->mapTableLength);
if (table_len > sb->s_blocksize - sizeof(*lvd)) {
udf_err(sb, "error loading logical volume descriptor: "
"Partition table too long (%u > %lu)\n", table_len,
sb->s_blocksize - sizeof(*lvd));
goto out_bh;
}
ret = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
if (ret)
goto out_bh;
for (i = 0, offset = 0;
i < sbi->s_partitions && offset < table_len;
i++, offset += gpm->partitionMapLength) {
struct udf_part_map *map = &sbi->s_partmaps[i];
gpm = (struct genericPartitionMap *)
&(lvd->partitionMaps[offset]);
type = gpm->partitionMapType;
if (type == 1) {
struct genericPartitionMap1 *gpm1 =
(struct genericPartitionMap1 *)gpm;
map->s_partition_type = UDF_TYPE1_MAP15;
map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum);
map->s_partition_num = le16_to_cpu(gpm1->partitionNum);
map->s_partition_func = NULL;
} else if (type == 2) {
struct udfPartitionMap2 *upm2 =
(struct udfPartitionMap2 *)gpm;
if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL,
strlen(UDF_ID_VIRTUAL))) {
u16 suf =
le16_to_cpu(((__le16 *)upm2->partIdent.
identSuffix)[0]);
if (suf < 0x0200) {
map->s_partition_type =
UDF_VIRTUAL_MAP15;
map->s_partition_func =
udf_get_pblock_virt15;
} else {
map->s_partition_type =
UDF_VIRTUAL_MAP20;
map->s_partition_func =
udf_get_pblock_virt20;
}
} else if (!strncmp(upm2->partIdent.ident,
UDF_ID_SPARABLE,
strlen(UDF_ID_SPARABLE))) {
if (udf_load_sparable_map(sb, map,
(struct sparablePartitionMap *)gpm) < 0)
goto out_bh;
} else if (!strncmp(upm2->partIdent.ident,
UDF_ID_METADATA,
strlen(UDF_ID_METADATA))) {
struct udf_meta_data *mdata =
&map->s_type_specific.s_metadata;
struct metadataPartitionMap *mdm =
(struct metadataPartitionMap *)
&(lvd->partitionMaps[offset]);
udf_debug("Parsing Logical vol part %d type %d id=%s\n",
i, type, UDF_ID_METADATA);
map->s_partition_type = UDF_METADATA_MAP25;
map->s_partition_func = udf_get_pblock_meta25;
mdata->s_meta_file_loc =
le32_to_cpu(mdm->metadataFileLoc);
mdata->s_mirror_file_loc =
le32_to_cpu(mdm->metadataMirrorFileLoc);
mdata->s_bitmap_file_loc =
le32_to_cpu(mdm->metadataBitmapFileLoc);
mdata->s_alloc_unit_size =
le32_to_cpu(mdm->allocUnitSize);
mdata->s_align_unit_size =
le16_to_cpu(mdm->alignUnitSize);
if (mdm->flags & 0x01)
mdata->s_flags |= MF_DUPLICATE_MD;
udf_debug("Metadata Ident suffix=0x%x\n",
le16_to_cpu(*(__le16 *)
mdm->partIdent.identSuffix));
udf_debug("Metadata part num=%d\n",
le16_to_cpu(mdm->partitionNum));
udf_debug("Metadata part alloc unit size=%d\n",
le32_to_cpu(mdm->allocUnitSize));
udf_debug("Metadata file loc=%d\n",
le32_to_cpu(mdm->metadataFileLoc));
udf_debug("Mirror file loc=%d\n",
le32_to_cpu(mdm->metadataMirrorFileLoc));
udf_debug("Bitmap file loc=%d\n",
le32_to_cpu(mdm->metadataBitmapFileLoc));
udf_debug("Flags: %d %d\n",
mdata->s_flags, mdm->flags);
} else {
udf_debug("Unknown ident: %s\n",
upm2->partIdent.ident);
continue;
}
map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum);
map->s_partition_num = le16_to_cpu(upm2->partitionNum);
}
udf_debug("Partition (%d:%d) type %d on volume %d\n",
i, map->s_partition_num, type, map->s_volumeseqnum);
}
if (fileset) {
struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]);
*fileset = lelb_to_cpu(la->extLocation);
udf_debug("FileSet found in LogicalVolDesc at block=%d, partition=%d\n",
fileset->logicalBlockNum,
fileset->partitionReferenceNum);
}
if (lvd->integritySeqExt.extLength)
udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
out_bh:
brelse(bh);
return ret;
}
/*
* udf_load_logicalvolint
*
*/
static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc)
{
struct buffer_head *bh = NULL;
uint16_t ident;
struct udf_sb_info *sbi = UDF_SB(sb);
struct logicalVolIntegrityDesc *lvid;
while (loc.extLength > 0 &&
(bh = udf_read_tagged(sb, loc.extLocation,
loc.extLocation, &ident)) &&
ident == TAG_IDENT_LVID) {
sbi->s_lvid_bh = bh;
lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
if (lvid->nextIntegrityExt.extLength)
udf_load_logicalvolint(sb,
leea_to_cpu(lvid->nextIntegrityExt));
if (sbi->s_lvid_bh != bh)
brelse(bh);
loc.extLength -= sb->s_blocksize;
loc.extLocation++;
}
if (sbi->s_lvid_bh != bh)
brelse(bh);
}
/*
* udf_process_sequence
*
* PURPOSE
* Process a main/reserve volume descriptor sequence.
*
* PRE-CONDITIONS
* sb Pointer to _locked_ superblock.
* block First block of first extent of the sequence.
* lastblock Lastblock of first extent of the sequence.
*
* HISTORY
* July 1, 1997 - Andrew E. Mileski
* Written, tested, and released.
*/
static noinline int udf_process_sequence(struct super_block *sb, long block,
long lastblock, struct kernel_lb_addr *fileset)
{
struct buffer_head *bh = NULL;
struct udf_vds_record vds[VDS_POS_LENGTH];
struct udf_vds_record *curr;
struct generic_desc *gd;
struct volDescPtr *vdp;
int done = 0;
uint32_t vdsn;
uint16_t ident;
long next_s = 0, next_e = 0;
memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
/*
* Read the main descriptor sequence and find which descriptors
* are in it.
*/
for (; (!done && block <= lastblock); block++) {
bh = udf_read_tagged(sb, block, block, &ident);
if (!bh) {
udf_err(sb,
"Block %llu of volume descriptor sequence is corrupted or we could not read it\n",
(unsigned long long)block);
return 1;
}
/* Process each descriptor (ISO 13346 3/8.3-8.4) */
gd = (struct generic_desc *)bh->b_data;
vdsn = le32_to_cpu(gd->volDescSeqNum);
switch (ident) {
case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */
curr = &vds[VDS_POS_PRIMARY_VOL_DESC];
if (vdsn >= curr->volDescSeqNum) {
curr->volDescSeqNum = vdsn;
curr->block = block;
}
break;
case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */
curr = &vds[VDS_POS_VOL_DESC_PTR];
if (vdsn >= curr->volDescSeqNum) {
curr->volDescSeqNum = vdsn;
curr->block = block;
vdp = (struct volDescPtr *)bh->b_data;
next_s = le32_to_cpu(
vdp->nextVolDescSeqExt.extLocation);
next_e = le32_to_cpu(
vdp->nextVolDescSeqExt.extLength);
next_e = next_e >> sb->s_blocksize_bits;
next_e += next_s;
}
break;
case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */
curr = &vds[VDS_POS_IMP_USE_VOL_DESC];
if (vdsn >= curr->volDescSeqNum) {
curr->volDescSeqNum = vdsn;
curr->block = block;
}
break;
case TAG_IDENT_PD: /* ISO 13346 3/10.5 */
curr = &vds[VDS_POS_PARTITION_DESC];
if (!curr->block)
curr->block = block;
break;
case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */
curr = &vds[VDS_POS_LOGICAL_VOL_DESC];
if (vdsn >= curr->volDescSeqNum) {
curr->volDescSeqNum = vdsn;
curr->block = block;
}
break;
case TAG_IDENT_USD: /* ISO 13346 3/10.8 */
curr = &vds[VDS_POS_UNALLOC_SPACE_DESC];
if (vdsn >= curr->volDescSeqNum) {
curr->volDescSeqNum = vdsn;
curr->block = block;
}
break;
case TAG_IDENT_TD: /* ISO 13346 3/10.9 */
vds[VDS_POS_TERMINATING_DESC].block = block;
if (next_e) {
block = next_s;
lastblock = next_e;
next_s = next_e = 0;
} else
done = 1;
break;
}
brelse(bh);
}
/*
* Now read interesting descriptors again and process them
* in a suitable order
*/
if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
udf_err(sb, "Primary Volume Descriptor not found!\n");
return 1;
}
if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
return 1;
if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
return 1;
if (vds[VDS_POS_PARTITION_DESC].block) {
/*
* We rescan the whole descriptor sequence to find
* partition descriptor blocks and process them.
*/
for (block = vds[VDS_POS_PARTITION_DESC].block;
block < vds[VDS_POS_TERMINATING_DESC].block;
block++)
if (udf_load_partdesc(sb, block))
return 1;
}
return 0;
}
static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh,
struct kernel_lb_addr *fileset)
{
struct anchorVolDescPtr *anchor;
long main_s, main_e, reserve_s, reserve_e;
anchor = (struct anchorVolDescPtr *)bh->b_data;
/* Locate the main sequence */
main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation);
main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength);
main_e = main_e >> sb->s_blocksize_bits;
main_e += main_s;
/* Locate the reserve sequence */
reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation);
reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength);
reserve_e = reserve_e >> sb->s_blocksize_bits;
reserve_e += reserve_s;
/* Process the main & reserve sequences */
/* responsible for finding the PartitionDesc(s) */
if (!udf_process_sequence(sb, main_s, main_e, fileset))
return 1;
udf_sb_free_partitions(sb);
if (!udf_process_sequence(sb, reserve_s, reserve_e, fileset))
return 1;
udf_sb_free_partitions(sb);
return 0;
}
/*
* Check whether there is an anchor block in the given block and
* load Volume Descriptor Sequence if so.
*/
static int udf_check_anchor_block(struct super_block *sb, sector_t block,
struct kernel_lb_addr *fileset)
{
struct buffer_head *bh;
uint16_t ident;
int ret;
if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) &&
udf_fixed_to_variable(block) >=
sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
return 0;
bh = udf_read_tagged(sb, block, block, &ident);
if (!bh)
return 0;
if (ident != TAG_IDENT_AVDP) {
brelse(bh);
return 0;
}
ret = udf_load_sequence(sb, bh, fileset);
brelse(bh);
return ret;
}
/* Search for an anchor volume descriptor pointer */
static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock,
struct kernel_lb_addr *fileset)
{
sector_t last[6];
int i;
struct udf_sb_info *sbi = UDF_SB(sb);
int last_count = 0;
/* First try user provided anchor */
if (sbi->s_anchor) {
if (udf_check_anchor_block(sb, sbi->s_anchor, fileset))
return lastblock;
}
/*
* according to spec, anchor is in either:
* block 256
* lastblock-256
* lastblock
* however, if the disc isn't closed, it could be 512.
*/
if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset))
return lastblock;
/*
* The trouble is which block is the last one. Drives often misreport
* this so we try various possibilities.
*/
last[last_count++] = lastblock;
if (lastblock >= 1)
last[last_count++] = lastblock - 1;
last[last_count++] = lastblock + 1;
if (lastblock >= 2)
last[last_count++] = lastblock - 2;
if (lastblock >= 150)
last[last_count++] = lastblock - 150;
if (lastblock >= 152)
last[last_count++] = lastblock - 152;
for (i = 0; i < last_count; i++) {
if (last[i] >= sb->s_bdev->bd_inode->i_size >>
sb->s_blocksize_bits)
continue;
if (udf_check_anchor_block(sb, last[i], fileset))
return last[i];
if (last[i] < 256)
continue;
if (udf_check_anchor_block(sb, last[i] - 256, fileset))
return last[i];
}
/* Finally try block 512 in case media is open */
if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset))
return last[0];
return 0;
}
/*
* Find an anchor volume descriptor and load Volume Descriptor Sequence from
* area specified by it. The function expects sbi->s_lastblock to be the last
* block on the media.
*
* Return 1 if ok, 0 if not found.
*
*/
static int udf_find_anchor(struct super_block *sb,
struct kernel_lb_addr *fileset)
{
sector_t lastblock;
struct udf_sb_info *sbi = UDF_SB(sb);
lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
if (lastblock)
goto out;
/* No anchor found? Try VARCONV conversion of block numbers */
UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
/* Firstly, we try to not convert number of the last block */
lastblock = udf_scan_anchors(sb,
udf_variable_to_fixed(sbi->s_last_block),
fileset);
if (lastblock)
goto out;
/* Secondly, we try with converted number of the last block */
lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset);
if (!lastblock) {
/* VARCONV didn't help. Clear it. */
UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV);
return 0;
}
out:
sbi->s_last_block = lastblock;
return 1;
}
/*
* Check Volume Structure Descriptor, find Anchor block and load Volume
* Descriptor Sequence
*/
static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt,
int silent, struct kernel_lb_addr *fileset)
{
struct udf_sb_info *sbi = UDF_SB(sb);
loff_t nsr_off;
if (!sb_set_blocksize(sb, uopt->blocksize)) {
if (!silent)
udf_warn(sb, "Bad block size\n");
return 0;
}
sbi->s_last_block = uopt->lastblock;
if (!uopt->novrs) {
/* Check that it is NSR02 compliant */
nsr_off = udf_check_vsd(sb);
if (!nsr_off) {
if (!silent)
udf_warn(sb, "No VRS found\n");
return 0;
}
if (nsr_off == -1)
udf_debug("Failed to read byte 32768. Assuming open disc. Skipping validity check\n");
if (!sbi->s_last_block)
sbi->s_last_block = udf_get_last_block(sb);
} else {
udf_debug("Validity check skipped because of novrs option\n");
}
/* Look for anchor block and load Volume Descriptor Sequence */
sbi->s_anchor = uopt->anchor;
if (!udf_find_anchor(sb, fileset)) {
if (!silent)
udf_warn(sb, "No anchor found\n");
return 0;
}
return 1;
}
static void udf_open_lvid(struct super_block *sb)
{
struct udf_sb_info *sbi = UDF_SB(sb);
struct buffer_head *bh = sbi->s_lvid_bh;
struct logicalVolIntegrityDesc *lvid;
struct logicalVolIntegrityDescImpUse *lvidiu;
if (!bh)
return;
mutex_lock(&sbi->s_alloc_mutex);
lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
lvidiu = udf_sb_lvidiu(sbi);
lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
udf_time_to_disk_stamp(&lvid->recordingDateAndTime,
CURRENT_TIME);
lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN);
lvid->descTag.descCRC = cpu_to_le16(
crc_itu_t(0, (char *)lvid + sizeof(struct tag),
le16_to_cpu(lvid->descTag.descCRCLength)));
lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
mark_buffer_dirty(bh);
sbi->s_lvid_dirty = 0;
mutex_unlock(&sbi->s_alloc_mutex);
}
static void udf_close_lvid(struct super_block *sb)
{
struct udf_sb_info *sbi = UDF_SB(sb);
struct buffer_head *bh = sbi->s_lvid_bh;
struct logicalVolIntegrityDesc *lvid;
struct logicalVolIntegrityDescImpUse *lvidiu;
if (!bh)
return;
mutex_lock(&sbi->s_alloc_mutex);
lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
lvidiu = udf_sb_lvidiu(sbi);
lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX;
lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX;
udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME);
if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev))
lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION);
if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev))
lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev);
if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev))
lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev);
lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
lvid->descTag.descCRC = cpu_to_le16(
crc_itu_t(0, (char *)lvid + sizeof(struct tag),
le16_to_cpu(lvid->descTag.descCRCLength)));
lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
/*
* We set buffer uptodate unconditionally here to avoid spurious
* warnings from mark_buffer_dirty() when previous EIO has marked
* the buffer as !uptodate
*/
set_buffer_uptodate(bh);
mark_buffer_dirty(bh);
sbi->s_lvid_dirty = 0;
mutex_unlock(&sbi->s_alloc_mutex);
}
u64 lvid_get_unique_id(struct super_block *sb)
{
struct buffer_head *bh;
struct udf_sb_info *sbi = UDF_SB(sb);
struct logicalVolIntegrityDesc *lvid;
struct logicalVolHeaderDesc *lvhd;
u64 uniqueID;
u64 ret;
bh = sbi->s_lvid_bh;
if (!bh)
return 0;
lvid = (struct logicalVolIntegrityDesc *)bh->b_data;
lvhd = (struct logicalVolHeaderDesc *)lvid->logicalVolContentsUse;
mutex_lock(&sbi->s_alloc_mutex);
ret = uniqueID = le64_to_cpu(lvhd->uniqueID);
if (!(++uniqueID & 0xFFFFFFFF))
uniqueID += 16;
lvhd->uniqueID = cpu_to_le64(uniqueID);
mutex_unlock(&sbi->s_alloc_mutex);
mark_buffer_dirty(bh);
return ret;
}
static int udf_fill_super(struct super_block *sb, void *options, int silent)
{
int ret;
struct inode *inode = NULL;
struct udf_options uopt;
struct kernel_lb_addr rootdir, fileset;
struct udf_sb_info *sbi;
uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT);
uopt.uid = -1;
uopt.gid = -1;
uopt.umask = 0;
uopt.fmode = UDF_INVALID_MODE;
uopt.dmode = UDF_INVALID_MODE;
sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL);
if (!sbi)
return -ENOMEM;
sb->s_fs_info = sbi;
mutex_init(&sbi->s_alloc_mutex);
if (!udf_parse_options((char *)options, &uopt, false))
goto error_out;
if (uopt.flags & (1 << UDF_FLAG_UTF8) &&
uopt.flags & (1 << UDF_FLAG_NLS_MAP)) {
udf_err(sb, "utf8 cannot be combined with iocharset\n");
goto error_out;
}
#ifdef CONFIG_UDF_NLS
if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) {
uopt.nls_map = load_nls_default();
if (!uopt.nls_map)
uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP);
else
udf_debug("Using default NLS map\n");
}
#endif
if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP)))
uopt.flags |= (1 << UDF_FLAG_UTF8);
fileset.logicalBlockNum = 0xFFFFFFFF;
fileset.partitionReferenceNum = 0xFFFF;
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;
sbi->s_nls_map = uopt.nls_map;
rwlock_init(&sbi->s_cred_lock);
if (uopt.session == 0xFFFFFFFF)
sbi->s_session = udf_get_last_session(sb);
else
sbi->s_session = uopt.session;
udf_debug("Multi-session=%d\n", sbi->s_session);
/* Fill in the rest of the superblock */
sb->s_op = &udf_sb_ops;
sb->s_export_op = &udf_export_ops;
sb->s_magic = UDF_SUPER_MAGIC;
sb->s_time_gran = 1000;
if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) {
ret = udf_load_vrs(sb, &uopt, silent, &fileset);
} else {
uopt.blocksize = bdev_logical_block_size(sb->s_bdev);
ret = udf_load_vrs(sb, &uopt, silent, &fileset);
if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) {
if (!silent)
pr_notice("Rescanning with blocksize %d\n",
UDF_DEFAULT_BLOCKSIZE);
uopt.blocksize = UDF_DEFAULT_BLOCKSIZE;
ret = udf_load_vrs(sb, &uopt, silent, &fileset);
}
}
if (!ret) {
udf_warn(sb, "No partition found (1)\n");
goto error_out;
}
udf_debug("Lastblock=%d\n", sbi->s_last_block);
if (sbi->s_lvid_bh) {
struct logicalVolIntegrityDescImpUse *lvidiu =
udf_sb_lvidiu(sbi);
uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev);
uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev);
/* uint16_t maxUDFWriteRev =
le16_to_cpu(lvidiu->maxUDFWriteRev); */
if (minUDFReadRev > UDF_MAX_READ_VERSION) {
udf_err(sb, "minUDFReadRev=%x (max is %x)\n",
le16_to_cpu(lvidiu->minUDFReadRev),
UDF_MAX_READ_VERSION);
goto error_out;
} else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION)
sb->s_flags |= MS_RDONLY;
sbi->s_udfrev = minUDFWriteRev;
if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE)
UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE);
if (minUDFReadRev >= UDF_VERS_USE_STREAMS)
UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS);
}
if (!sbi->s_partitions) {
udf_warn(sb, "No partition found (2)\n");
goto error_out;
}
if (sbi->s_partmaps[sbi->s_partition].s_partition_flags &
UDF_PART_FLAG_READ_ONLY) {
pr_notice("Partition marked readonly; forcing readonly mount\n");
sb->s_flags |= MS_RDONLY;
}
if (udf_find_fileset(sb, &fileset, &rootdir)) {
udf_warn(sb, "No fileset found\n");
goto error_out;
}
if (!silent) {
struct timestamp ts;
udf_time_to_disk_stamp(&ts, sbi->s_record_time);
udf_info("Mounting volume '%s', timestamp %04u/%02u/%02u %02u:%02u (%x)\n",
sbi->s_volume_ident,
le16_to_cpu(ts.year), ts.month, ts.day,
ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone));
}
if (!(sb->s_flags & MS_RDONLY))
udf_open_lvid(sb);
/* Assign the root inode */
/* assign inodes by physical block number */
/* perhaps it's not extensible enough, but for now ... */
inode = udf_iget(sb, &rootdir);
if (!inode) {
udf_err(sb, "Error in udf_iget, block=%d, partition=%d\n",
rootdir.logicalBlockNum, rootdir.partitionReferenceNum);
goto error_out;
}
/* Allocate a dentry for the root inode */
sb->s_root = d_make_root(inode);
if (!sb->s_root) {
udf_err(sb, "Couldn't allocate root dentry\n");
goto error_out;
}
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_max_links = UDF_MAX_LINKS;
return 0;
error_out:
if (sbi->s_vat_inode)
iput(sbi->s_vat_inode);
#ifdef CONFIG_UDF_NLS
if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
unload_nls(sbi->s_nls_map);
#endif
if (!(sb->s_flags & MS_RDONLY))
udf_close_lvid(sb);
brelse(sbi->s_lvid_bh);
udf_sb_free_partitions(sb);
kfree(sbi);
sb->s_fs_info = NULL;
return -EINVAL;
}
void _udf_err(struct super_block *sb, const char *function,
const char *fmt, ...)
{
struct va_format vaf;
va_list args;
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
pr_err("error (device %s): %s: %pV", sb->s_id, function, &vaf);
va_end(args);
}
void _udf_warn(struct super_block *sb, const char *function,
const char *fmt, ...)
{
struct va_format vaf;
va_list args;
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
pr_warn("warning (device %s): %s: %pV", sb->s_id, function, &vaf);
va_end(args);
}
static void udf_put_super(struct super_block *sb)
{
struct udf_sb_info *sbi;
sbi = UDF_SB(sb);
if (sbi->s_vat_inode)
iput(sbi->s_vat_inode);
#ifdef CONFIG_UDF_NLS
if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
unload_nls(sbi->s_nls_map);
#endif
if (!(sb->s_flags & MS_RDONLY))
udf_close_lvid(sb);
brelse(sbi->s_lvid_bh);
udf_sb_free_partitions(sb);
kfree(sb->s_fs_info);
sb->s_fs_info = NULL;
}
static int udf_sync_fs(struct super_block *sb, int wait)
{
struct udf_sb_info *sbi = UDF_SB(sb);
mutex_lock(&sbi->s_alloc_mutex);
if (sbi->s_lvid_dirty) {
/*
* Blockdevice will be synced later so we don't have to submit
* the buffer for IO
*/
mark_buffer_dirty(sbi->s_lvid_bh);
sbi->s_lvid_dirty = 0;
}
mutex_unlock(&sbi->s_alloc_mutex);
return 0;
}
static int udf_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct super_block *sb = dentry->d_sb;
struct udf_sb_info *sbi = UDF_SB(sb);
struct logicalVolIntegrityDescImpUse *lvidiu;
u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
if (sbi->s_lvid_bh != NULL)
lvidiu = udf_sb_lvidiu(sbi);
else
lvidiu = NULL;
buf->f_type = UDF_SUPER_MAGIC;
buf->f_bsize = sb->s_blocksize;
buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len;
buf->f_bfree = udf_count_free(sb);
buf->f_bavail = buf->f_bfree;
buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) +
le32_to_cpu(lvidiu->numDirs)) : 0)
+ buf->f_bfree;
buf->f_ffree = buf->f_bfree;
buf->f_namelen = UDF_NAME_LEN - 2;
buf->f_fsid.val[0] = (u32)id;
buf->f_fsid.val[1] = (u32)(id >> 32);
return 0;
}
static unsigned int udf_count_free_bitmap(struct super_block *sb,
struct udf_bitmap *bitmap)
{
struct buffer_head *bh = NULL;
unsigned int accum = 0;
int index;
int block = 0, newblock;
struct kernel_lb_addr loc;
uint32_t bytes;
uint8_t *ptr;
uint16_t ident;
struct spaceBitmapDesc *bm;
loc.logicalBlockNum = bitmap->s_extPosition;
loc.partitionReferenceNum = UDF_SB(sb)->s_partition;
bh = udf_read_ptagged(sb, &loc, 0, &ident);
if (!bh) {
udf_err(sb, "udf_count_free failed\n");
goto out;
} else if (ident != TAG_IDENT_SBD) {
brelse(bh);
udf_err(sb, "udf_count_free failed\n");
goto out;
}
bm = (struct spaceBitmapDesc *)bh->b_data;
bytes = le32_to_cpu(bm->numOfBytes);
index = sizeof(struct spaceBitmapDesc); /* offset in first block only */
ptr = (uint8_t *)bh->b_data;
while (bytes > 0) {
u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index);
accum += bitmap_weight((const unsigned long *)(ptr + index),
cur_bytes * 8);
bytes -= cur_bytes;
if (bytes) {
brelse(bh);
newblock = udf_get_lb_pblock(sb, &loc, ++block);
bh = udf_tread(sb, newblock);
if (!bh) {
udf_debug("read failed\n");
goto out;
}
index = 0;
ptr = (uint8_t *)bh->b_data;
}
}
brelse(bh);
out:
return accum;
}
static unsigned int udf_count_free_table(struct super_block *sb,
struct inode *table)
{
unsigned int accum = 0;
uint32_t elen;
struct kernel_lb_addr eloc;
int8_t etype;
struct extent_position epos;
mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
epos.block = UDF_I(table)->i_location;
epos.offset = sizeof(struct unallocSpaceEntry);
epos.bh = NULL;
while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1)
accum += (elen >> table->i_sb->s_blocksize_bits);
brelse(epos.bh);
mutex_unlock(&UDF_SB(sb)->s_alloc_mutex);
return accum;
}
static unsigned int udf_count_free(struct super_block *sb)
{
unsigned int accum = 0;
struct udf_sb_info *sbi;
struct udf_part_map *map;
sbi = UDF_SB(sb);
if (sbi->s_lvid_bh) {
struct logicalVolIntegrityDesc *lvid =
(struct logicalVolIntegrityDesc *)
sbi->s_lvid_bh->b_data;
if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) {
accum = le32_to_cpu(
lvid->freeSpaceTable[sbi->s_partition]);
if (accum == 0xFFFFFFFF)
accum = 0;
}
}
if (accum)
return accum;
map = &sbi->s_partmaps[sbi->s_partition];
if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) {
accum += udf_count_free_bitmap(sb,
map->s_uspace.s_bitmap);
}
if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) {
accum += udf_count_free_bitmap(sb,
map->s_fspace.s_bitmap);
}
if (accum)
return accum;
if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) {
accum += udf_count_free_table(sb,
map->s_uspace.s_table);
}
if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) {
accum += udf_count_free_table(sb,
map->s_fspace.s_table);
}
return accum;
}
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