[GFS2] Merge the rd_last_alloc_meta and rd_last_alloc_data fields

We don't need to keep track of when we last allocated data
and metadata separately since the only thing thats important
when searching for a free block is whether its free or not,
which is independent from what type of block it is.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/incore.h

@@ -90,8 +90,7 @@ struct gfs2_rgrpd {
 	struct mutex rd_mutex;
 	u32 rd_free_clone;
 	struct gfs2_log_element rd_le;
-	u32 rd_last_alloc_data;
-	u32 rd_last_alloc_meta;
+	u32 rd_last_alloc;
 	struct gfs2_sbd *rd_sbd;
 	unsigned char rd_flags;
 #define GFS2_RDF_CHECK        0x01      /* Need to check for unlinked inodes */

fs/gfs2/rgrp.c

@@ -1422,11 +1422,11 @@ u64 gfs2_alloc_data(struct gfs2_inode *ip)
 	if (rgrp_contains_block(rgd, ip->i_goal))
 		goal = ip->i_goal - rgd->rd_data0;
 	else
-		goal = rgd->rd_last_alloc_data;
+		goal = rgd->rd_last_alloc;
 
 	blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, GFS2_BLKST_USED);
 	BUG_ON(blk == BFITNOENT);
-	rgd->rd_last_alloc_data = blk;
+	rgd->rd_last_alloc = blk;
 
 	block = rgd->rd_data0 + blk;
 	ip->i_goal = block;
@@ -1467,11 +1467,11 @@ u64 gfs2_alloc_meta(struct gfs2_inode *ip)
 	if (rgrp_contains_block(rgd, ip->i_goal))
 		goal = ip->i_goal - rgd->rd_data0;
 	else
-		goal = rgd->rd_last_alloc_meta;
+		goal = rgd->rd_last_alloc;
 
 	blk = rgblk_search(rgd, goal, GFS2_BLKST_FREE, GFS2_BLKST_USED);
 	BUG_ON(blk == BFITNOENT);
-	rgd->rd_last_alloc_meta = blk;
+	rgd->rd_last_alloc = blk;
 
 	block = rgd->rd_data0 + blk;
 	ip->i_goal = block;
@@ -1510,11 +1510,11 @@ u64 gfs2_alloc_di(struct gfs2_inode *dip, u64 *generation)
 	u32 blk;
 	u64 block;
 
-	blk = rgblk_search(rgd, rgd->rd_last_alloc_meta,
+	blk = rgblk_search(rgd, rgd->rd_last_alloc,
 			   GFS2_BLKST_FREE, GFS2_BLKST_DINODE);
 	BUG_ON(blk == BFITNOENT);
 
-	rgd->rd_last_alloc_meta = blk;
+	rgd->rd_last_alloc = blk;
 
 	block = rgd->rd_data0 + blk;