udf: remove some ugly macros

remove macros:
- UDF_SB_PARTMAPS
- UDF_SB_PARTTYPE
- UDF_SB_PARTROOT
- UDF_SB_PARTLEN
- UDF_SB_PARTVSN
- UDF_SB_PARTNUM
- UDF_SB_TYPESPAR
- UDF_SB_TYPEVIRT
- UDF_SB_PARTFUNC
- UDF_SB_PARTFLAGS
- UDF_SB_VOLIDENT
- UDF_SB_NUMPARTS
- UDF_SB_PARTITION
- UDF_SB_SESSION
- UDF_SB_ANCHOR
- UDF_SB_LASTBLOCK
- UDF_SB_LVIDBH
- UDF_SB_LVID
- UDF_SB_UMASK
- UDF_SB_GID
- UDF_SB_UID
- UDF_SB_RECORDTIME
- UDF_SB_SERIALNUM
- UDF_SB_UDFREV
- UDF_SB_FLAGS
- UDF_SB_VAT
- UDF_UPDATE_UDFREV
- UDF_SB_FREE
and open code them

convert UDF_SB_LVIDIU macro to udf_sb_lvidiu function

rename some struct udf_sb_info fields:
- s_volident to s_volume_ident
- s_lastblock to s_last_block
- s_lvidbh to s_lvid_bh
- s_recordtime to s_record_time
- s_serialnum to s_serial_number;
- s_vat to s_vat_inode;

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Ben Fennema <bfennema@falcon.csc.calpoly.edu>
Cc: Jan Kara <jack@suse.cz>
Acked-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/udf_fs_sb.h b/include/linux/udf_fs_sb.h
index 80ae9ef..9bc4735 100644
--- a/include/linux/udf_fs_sb.h
+++ b/include/linux/udf_fs_sb.h
@@ -75,7 +75,7 @@
 struct udf_sb_info
 {
 	struct udf_part_map	*s_partmaps;
-	__u8			s_volident[32];
+	__u8			s_volume_ident[32];
 
 	/* Overall info */
 	__u16			s_partitions;
@@ -84,9 +84,9 @@
 	/* Sector headers */
 	__s32			s_session;
 	__u32			s_anchor[4];
-	__u32			s_lastblock;
+	__u32			s_last_block;
 
-	struct buffer_head	*s_lvidbh;
+	struct buffer_head	*s_lvid_bh;
 
 	/* Default permissions */
 	mode_t			s_umask;
@@ -94,10 +94,10 @@
 	uid_t			s_uid;
 
 	/* Root Info */
-	struct timespec		s_recordtime;
+	struct timespec		s_record_time;
 
 	/* Fileset Info */
-	__u16			s_serialnum;
+	__u16			s_serial_number;
 
 	/* highest UDF revision we have recorded to this media */
 	__u16			s_udfrev;
@@ -109,7 +109,7 @@
 	struct nls_table	*s_nls_map;
 
 	/* VAT inode */
-	struct inode		*s_vat;
+	struct inode		*s_vat_inode;
 
 	struct mutex		s_alloc_mutex;
 };