udf_sb.h

这是Linux系统下的对UDF文件系统新增的功能

#ifndef __LINUX_UDF_SB_H
#define __LINUX_UDF_SB_H

/* Since UDF 2.01 is ISO 13346 based... */
#define UDF_SUPER_MAGIC			0x15013346

#define UDF_MAX_READ_VERSION		0x0201
#define UDF_MAX_WRITE_VERSION		0x0201

#define UDF_FLAG_USE_EXTENDED_FE	0
#define UDF_VERS_USE_EXTENDED_FE	0x0200
#define UDF_FLAG_USE_STREAMS		1
#define UDF_VERS_USE_STREAMS		0x0200
#define UDF_FLAG_USE_SHORT_AD		2
#define UDF_FLAG_USE_AD_IN_ICB		3
#define UDF_FLAG_USE_FILE_CTIME_EA	4
#define UDF_FLAG_STRICT			5
#define UDF_FLAG_UNDELETE		6
#define UDF_FLAG_UNHIDE			7
#define UDF_FLAG_VARCONV		8
#define UDF_FLAG_NLS_MAP		9
#define UDF_FLAG_UTF8			10

#define UDF_PART_FLAG_UNALLOC_BITMAP	0x0001
#define UDF_PART_FLAG_UNALLOC_TABLE	0x0002
#define UDF_PART_FLAG_FREED_BITMAP	0x0004
#define UDF_PART_FLAG_FREED_TABLE	0x0008
#define UDF_PART_FLAG_READ_ONLY		0x0010
#define UDF_PART_FLAG_WRITE_ONCE	0x0020
#define UDF_PART_FLAG_REWRITABLE	0x0040
#define UDF_PART_FLAG_OVERWRITABLE	0x0080

static inline struct udf_sb_info *UDF_SB(struct super_block *sb)
{
	return sb->s_fs_info;
}

#define UDF_SB_FREE(X)\
{\
	if (UDF_SB(X))\
	{\
		if (UDF_SB_PARTMAPS(X))\
			kfree(UDF_SB_PARTMAPS(X));\
		UDF_SB_PARTMAPS(X) = NULL;\
	}\
}

#define UDF_SB_ALLOC_PARTMAPS(X,Y)\
{\
	UDF_SB_PARTMAPS(X) = kmalloc(sizeof(struct udf_part_map) * Y, GFP_KERNEL);\
	if (UDF_SB_PARTMAPS(X) != NULL)\
	{\
		UDF_SB_NUMPARTS(X) = Y;\
		memset(UDF_SB_PARTMAPS(X), 0x00, sizeof(struct udf_part_map) * Y);\
	}\
	else\
	{\
		UDF_SB_NUMPARTS(X) = 0;\
		udf_error(X, __FUNCTION__, "Unable to allocate space for %d partition maps", Y);\
	}\
}

#define UDF_SB_ALLOC_BITMAP(X,Y,Z)\
{\
	int nr_groups = ((UDF_SB_PARTLEN((X),(Y)) + (sizeof(struct spaceBitmapDesc) << 3) +\
		((X)->s_blocksize * 8) - 1) / ((X)->s_blocksize * 8));\
	int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) * nr_groups);\
	if (size <= PAGE_SIZE)\
		UDF_SB_PARTMAPS(X)[(Y)].Z.s_bitmap = kmalloc(size, GFP_KERNEL);\
	else\
		UDF_SB_PARTMAPS(X)[(Y)].Z.s_bitmap = vmalloc(size);\
	if (UDF_SB_PARTMAPS(X)[(Y)].Z.s_bitmap != NULL)\
	{\
		memset(UDF_SB_PARTMAPS(X)[(Y)].Z.s_bitmap, 0x00, size);\
		UDF_SB_PARTMAPS(X)[(Y)].Z.s_bitmap->s_block_bitmap =\
			(struct buffer_head **)(UDF_SB_PARTMAPS(X)[(Y)].Z.s_bitmap + 1);\
		UDF_SB_PARTMAPS(X)[(Y)].Z.s_bitmap->s_nr_groups = nr_groups;\
	}\
	else\
	{\
		udf_error(X, __FUNCTION__, "Unable to allocate space for bitmap and %d buffer_head pointers", nr_groups);\
	}\
}

#define UDF_SB_FREE_BITMAP(X,Y,Z)\
{\
	int i;\
	int nr_groups = UDF_SB_BITMAP_NR_GROUPS(X,Y,Z);\
	int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) * nr_groups);\
	for (i=0; i<nr_groups; i++)\
	{\
		if (UDF_SB_BITMAP(X,Y,Z,i))\
			udf_release_data(UDF_SB_BITMAP(X,Y,Z,i));\
	}\
	if (size <= PAGE_SIZE)\
		kfree(UDF_SB_PARTMAPS(X)[Y].Z.s_bitmap);\
	else\
		vfree(UDF_SB_PARTMAPS(X)[Y].Z.s_bitmap);\
}

#define UDF_QUERY_FLAG(X,Y)			( UDF_SB(X)->s_flags & ( 1 << (Y) ) )
#define UDF_SET_FLAG(X,Y)			( UDF_SB(X)->s_flags |= ( 1 << (Y) ) )
#define UDF_CLEAR_FLAG(X,Y)			( UDF_SB(X)->s_flags &= ~( 1 << (Y) ) )

#define UDF_UPDATE_UDFREV(X,Y)			( ((Y) > UDF_SB_UDFREV(X)) ? UDF_SB_UDFREV(X) = (Y) : UDF_SB_UDFREV(X) )

#define UDF_SB_PARTMAPS(X)			( UDF_SB(X)->s_partmaps )
#define UDF_SB_PARTTYPE(X,Y)			( UDF_SB_PARTMAPS(X)[(Y)].s_partition_type )
#define UDF_SB_PARTROOT(X,Y)			( UDF_SB_PARTMAPS(X)[(Y)].s_partition_root )
#define UDF_SB_PARTLEN(X,Y)			( UDF_SB_PARTMAPS(X)[(Y)].s_partition_len )
#define UDF_SB_PARTVSN(X,Y)			( UDF_SB_PARTMAPS(X)[(Y)].s_volumeseqnum )
#define UDF_SB_PARTNUM(X,Y)			( UDF_SB_PARTMAPS(X)[(Y)].s_partition_num )
#define UDF_SB_TYPESPAR(X,Y)			( UDF_SB_PARTMAPS(X)[(Y)].s_type_specific.s_sparing )
#define UDF_SB_TYPEVIRT(X,Y)			( UDF_SB_PARTMAPS(X)[(Y)].s_type_specific.s_virtual )
#define UDF_SB_PARTFUNC(X,Y)			( UDF_SB_PARTMAPS(X)[(Y)].s_partition_func )
#define UDF_SB_PARTFLAGS(X,Y)			( UDF_SB_PARTMAPS(X)[(Y)].s_partition_flags )
#define UDF_SB_BITMAP(X,Y,Z,I)			( UDF_SB_PARTMAPS(X)[(Y)].Z.s_bitmap->s_block_bitmap[I] )
#define UDF_SB_BITMAP_NR_GROUPS(X,Y,Z)		( UDF_SB_PARTMAPS(X)[(Y)].Z.s_bitmap->s_nr_groups )

#define UDF_SB_VOLIDENT(X)			( UDF_SB(X)->s_volident )
#define UDF_SB_NUMPARTS(X)			( UDF_SB(X)->s_partitions )
#define UDF_SB_PARTITION(X)			( UDF_SB(X)->s_partition )
#define UDF_SB_SESSION(X)			( UDF_SB(X)->s_session )
#define UDF_SB_ANCHOR(X)			( UDF_SB(X)->s_anchor )
#define UDF_SB_LASTBLOCK(X)			( UDF_SB(X)->s_lastblock )
#define UDF_SB_LVIDBH(X)			( UDF_SB(X)->s_lvidbh )
#define UDF_SB_LVID(X)				( (struct logicalVolIntegrityDesc *)UDF_SB_LVIDBH(X)->b_data )
#define UDF_SB_LVIDIU(X)			( (struct logicalVolIntegrityDescImpUse *)&(UDF_SB_LVID(X)->impUse[le32_to_cpu(UDF_SB_LVID(X)->numOfPartitions) * 2 * sizeof(uint32_t)/sizeof(uint8_t)]) )

#define UDF_SB_UMASK(X)				( UDF_SB(X)->s_umask )
#define UDF_SB_GID(X)				( UDF_SB(X)->s_gid )
#define UDF_SB_UID(X)				( UDF_SB(X)->s_uid )
#define UDF_SB_RECORDTIME(X)			( UDF_SB(X)->s_recordtime )
#define UDF_SB_SERIALNUM(X)			( UDF_SB(X)->s_serialnum )
#define UDF_SB_UDFREV(X)			( UDF_SB(X)->s_udfrev )
#define UDF_SB_FLAGS(X)				( UDF_SB(X)->s_flags )
#define UDF_SB_VAT(X)				( UDF_SB(X)->s_vat )

#endif /* __LINUX_UDF_SB_H */