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super.c
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super.c
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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/smp_lock.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 <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
static char error_buf[1024];
/* 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 void udf_write_super(struct super_block *);
static int udf_remount_fs(struct super_block *, int *, char *);
static int udf_check_valid(struct super_block *, int, int);
static int udf_vrs(struct super_block *sb, int silent);
static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
static void udf_find_anchor(struct super_block *);
static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
kernel_lb_addr *);
static void udf_load_fileset(struct super_block *, struct buffer_head *,
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 vfsmount *);
static void udf_error(struct super_block *sb, const char *function,
const char *fmt, ...);
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 int udf_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data,
struct vfsmount *mnt)
{
return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
}
static struct file_system_type udf_fstype = {
.owner = THIS_MODULE,
.name = "udf",
.get_sb = udf_get_sb,
.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;
return &ei->vfs_inode;
}
static void udf_destroy_inode(struct inode *inode)
{
kmem_cache_free(udf_inode_cachep, UDF_I(inode));
}
static void init_once(struct kmem_cache *cachep, 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,
.delete_inode = udf_delete_inode,
.clear_inode = udf_clear_inode,
.put_super = udf_put_super,
.write_super = udf_write_super,
.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;
mode_t umask;
gid_t gid;
uid_t uid;
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_error(sb, __FUNCTION__,
"Unable to allocate space for %d partition maps",
count);
sbi->s_partitions = 0;
return -ENOMEM;
}
sbi->s_partitions = count;
return 0;
}
static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt)
{
struct super_block *sb = mnt->mnt_sb;
struct udf_sb_info *sbi = UDF_SB(sb);
if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT))
seq_puts(seq, ",nostrict");
if (sb->s_blocksize != UDF_DEFAULT_BLOCKSIZE)
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=%o", sbi->s_umask);
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);
/*
* s_anchor[2] could be zeroed out in case there is no anchor
* in the specified block, but then the "anchor=N" option
* originally given by the user wasn't effective, so it's OK
* if we don't show it.
*/
if (sbi->s_anchor[2] != 0)
seq_printf(seq, ",anchor=%u", sbi->s_anchor[2]);
/*
* 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.
* 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
};
static 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_err, NULL}
};
static int udf_parse_options(char *options, struct udf_options *uopt,
bool remount)
{
char *p;
int option;
uopt->novrs = 0;
uopt->blocksize = UDF_DEFAULT_BLOCKSIZE;
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;
case Opt_bs:
if (match_int(&args[0], &option))
return 0;
uopt->blocksize = option;
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;
default:
printk(KERN_ERR "udf: bad mount option \"%s\" "
"or missing value\n", p);
return 0;
}
}
return 1;
}
static void udf_write_super(struct super_block *sb)
{
lock_kernel();
if (!(sb->s_flags & MS_RDONLY))
udf_open_lvid(sb);
sb->s_dirt = 0;
unlock_kernel();
}
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);
uopt.flags = sbi->s_flags;
uopt.uid = sbi->s_uid;
uopt.gid = sbi->s_gid;
uopt.umask = sbi->s_umask;
if (!udf_parse_options(options, &uopt, true))
return -EINVAL;
sbi->s_flags = uopt.flags;
sbi->s_uid = uopt.uid;
sbi->s_gid = uopt.gid;
sbi->s_umask = uopt.umask;
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))
return 0;
if (*flags & MS_RDONLY)
udf_close_lvid(sb);
else
udf_open_lvid(sb);
return 0;
}
static int udf_vrs(struct super_block *sb, int silent)
{
struct volStructDesc *vsd = NULL;
loff_t sector = 32768;
int sectorsize;
struct buffer_head *bh = NULL;
int iso9660 = 0;
int nsr02 = 0;
int nsr03 = 0;
struct udf_sb_info *sbi;
/* Block size must be a multiple of 512 */
if (sb->s_blocksize & 511)
return 0;
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",
(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)) {
iso9660 = sector;
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;
}
/*
* Check whether there is an anchor block in the given block
*/
static int udf_check_anchor_block(struct super_block *sb, sector_t block,
bool varconv)
{
struct buffer_head *bh = NULL;
tag *t;
uint16_t ident;
uint32_t location;
if (varconv) {
if (udf_fixed_to_variable(block) >=
sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
return 0;
bh = sb_bread(sb, udf_fixed_to_variable(block));
}
else
bh = sb_bread(sb, block);
if (!bh)
return 0;
t = (tag *)bh->b_data;
ident = le16_to_cpu(t->tagIdent);
location = le32_to_cpu(t->tagLocation);
brelse(bh);
if (ident != TAG_IDENT_AVDP)
return 0;
return location == block;
}
/* Search for an anchor volume descriptor pointer */
static sector_t udf_scan_anchors(struct super_block *sb, bool varconv,
sector_t lastblock)
{
sector_t last[6];
int i;
struct udf_sb_info *sbi = UDF_SB(sb);
last[0] = lastblock;
last[1] = last[0] - 1;
last[2] = last[0] + 1;
last[3] = last[0] - 2;
last[4] = last[0] - 150;
last[5] = last[0] - 152;
/* according to spec, anchor is in either:
* block 256
* lastblock-256
* lastblock
* however, if the disc isn't closed, it could be 512 */
for (i = 0; i < ARRAY_SIZE(last); i++) {
if (last[i] < 0)
continue;
if (last[i] >= sb->s_bdev->bd_inode->i_size >>
sb->s_blocksize_bits)
continue;
if (udf_check_anchor_block(sb, last[i], varconv)) {
sbi->s_anchor[0] = last[i];
sbi->s_anchor[1] = last[i] - 256;
return last[i];
}
if (last[i] < 256)
continue;
if (udf_check_anchor_block(sb, last[i] - 256, varconv)) {
sbi->s_anchor[1] = last[i] - 256;
return last[i];
}
}
if (udf_check_anchor_block(sb, sbi->s_session + 256, varconv)) {
sbi->s_anchor[0] = sbi->s_session + 256;
return last[0];
}
if (udf_check_anchor_block(sb, sbi->s_session + 512, varconv)) {
sbi->s_anchor[0] = sbi->s_session + 512;
return last[0];
}
return 0;
}
/*
* Find an anchor volume descriptor. The function expects sbi->s_lastblock to
* be the last block on the media.
*
* Return 1 if not found, 0 if ok
*
*/
static void udf_find_anchor(struct super_block *sb)
{
sector_t lastblock;
struct buffer_head *bh = NULL;
uint16_t ident;
int i;
struct udf_sb_info *sbi = UDF_SB(sb);
lastblock = udf_scan_anchors(sb, 0, sbi->s_last_block);
if (lastblock)
goto check_anchor;
/* No anchor found? Try VARCONV conversion of block numbers */
/* Firstly, we try to not convert number of the last block */
lastblock = udf_scan_anchors(sb, 1,
udf_variable_to_fixed(sbi->s_last_block));
if (lastblock) {
UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
goto check_anchor;
}
/* Secondly, we try with converted number of the last block */
lastblock = udf_scan_anchors(sb, 1, sbi->s_last_block);
if (lastblock)
UDF_SET_FLAG(sb, UDF_FLAG_VARCONV);
check_anchor:
/*
* Check located anchors and the anchor block supplied via
* mount options
*/
for (i = 0; i < ARRAY_SIZE(sbi->s_anchor); i++) {
if (!sbi->s_anchor[i])
continue;
bh = udf_read_tagged(sb, sbi->s_anchor[i],
sbi->s_anchor[i], &ident);
if (!bh)
sbi->s_anchor[i] = 0;
else {
brelse(bh);
if (ident != TAG_IDENT_AVDP)
sbi->s_anchor[i] = 0;
}
}
sbi->s_last_block = lastblock;
}
static int udf_find_fileset(struct super_block *sb,
kernel_lb_addr *fileset,
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 */
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;
struct ustr outstr;
struct buffer_head *bh;
uint16_t ident;
bh = udf_read_tagged(sb, block, block, &ident);
if (!bh)
return 1;
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
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);
return 0;
}
static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
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 = kmalloc(size, GFP_KERNEL);
else
bitmap = vmalloc(size); /* TODO: get rid of vmalloc */
if (bitmap == NULL) {
udf_error(sb, __FUNCTION__,
"Unable to allocate space for bitmap "
"and %d buffer_head pointers", nr_groups);
return NULL;
}
memset(bitmap, 0x00, size);
bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1);
bitmap->s_nr_groups = nr_groups;