Commit message: udf: Avoid run away loop when partition table length is corrupted

Check provided length of partition table so that (possibly maliciously)
corrupted partition table cannot cause accessing data beyond current buffer.

Signed-off-by: Jan Kara <jack@suse.cz>
CVE: CVE-2012-3400
CWE: CWE-119
Vulnerability description: Heap-based buffer overflow in the udf_load_logicalvol function in fs/udf/super.c in the Linux kernel before 3.4.5 allows remote attackers to cause a denial of service (system crash) or possibly have unspecified other impact via a crafted UDF filesystem.

Project: linux
File: super.c

void _udf_err(struct super_block *sb, const char *function,
	      const char *fmt, ...)
{
	struct va_format vaf;
	va_list args;

	/* mark sb error */
	if (!(sb->s_flags & MS_RDONLY))
		sb->s_dirt = 1;

	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);
}

Project: linux
File: super.c

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);
}

Project: linux
File: super.c

static void destroy_inodecache(void)
{
	kmem_cache_destroy(udf_inode_cachep);
}

Project: linux
File: super.c

static void __exit exit_udf_fs(void)
{
	unregister_filesystem(&udf_fstype);
	destroy_inodecache();
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

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);
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

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);
}

Project: linux
File: super.c

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);
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

static void udf_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, udf_i_callback);
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

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);
	}
}

Project: linux
File: super.c

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;
	}
}

Project: linux
File: super.c

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));
}

Project: linux
File: super.c

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);
}

Project: linux
File: super.c

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);
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

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;
	return !udf_process_sequence(sb, reserve_s, reserve_e, fileset);
}

Project: linux
File: super.c

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);
}

Project: linux
File: super.c

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);
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

static void udf_put_super(struct super_block *sb)
{
	int i;
	struct udf_sb_info *sbi;

	sbi = UDF_SB(sb);

	if (sbi->s_vat_inode)
		iput(sbi->s_vat_inode);
	if (sbi->s_partitions)
		for (i = 0; i < sbi->s_partitions; i++)
			udf_free_partition(&sbi->s_partmaps[i]);
#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);
	kfree(sbi->s_partmaps);
	kfree(sb->s_fs_info);
	sb->s_fs_info = NULL;
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

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);
}

Project: linux
File: super.c

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]);
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

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;
}

Project: linux
File: super.c

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);
		sb->s_dirt = 0;
		sbi->s_lvid_dirty = 0;
	}
	mutex_unlock(&sbi->s_alloc_mutex);

	return 0;
}