ext4: Convert bg_inode_bitmap and bg_inode_table

Convert bg_inode_bitmap and bg_inode_table to bg_inode_bitmap_lo
and bg_inode_table_lo.  This helps in finding BUGs due to
direct partial access of these split 64 bit values

Also fix one direct partial access
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

fs/ext4/balloc.c

@@ -115,7 +115,7 @@ unsigned ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh,
 		/* Set bits for block and inode bitmaps, and inode table */
 		ext4_set_bit(ext4_block_bitmap(sb, gdp) - start, bh->b_data);
 		ext4_set_bit(ext4_inode_bitmap(sb, gdp) - start, bh->b_data);
-		for (bit = le32_to_cpu(gdp->bg_inode_table) - start,
+		for (bit = (ext4_inode_table(sb, gdp) - start),
 		     bit_max = bit + sbi->s_itb_per_group; bit < bit_max; bit++)
 			ext4_set_bit(bit, bh->b_data);
 

fs/ext4/super.c

@@ -78,7 +78,7 @@ ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
 ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
 			       struct ext4_group_desc *bg)
 {
-	return le32_to_cpu(bg->bg_inode_bitmap) |
+	return le32_to_cpu(bg->bg_inode_bitmap_lo) |
 		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 		(ext4_fsblk_t)le32_to_cpu(bg->bg_inode_bitmap_hi) << 32 : 0);
 }
@@ -86,7 +86,7 @@ ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
 ext4_fsblk_t ext4_inode_table(struct super_block *sb,
 			      struct ext4_group_desc *bg)
 {
-	return le32_to_cpu(bg->bg_inode_table) |
+	return le32_to_cpu(bg->bg_inode_table_lo) |
 		(EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT ?
 		(ext4_fsblk_t)le32_to_cpu(bg->bg_inode_table_hi) << 32 : 0);
 }
@@ -102,7 +102,7 @@ void ext4_block_bitmap_set(struct super_block *sb,
 void ext4_inode_bitmap_set(struct super_block *sb,
 			   struct ext4_group_desc *bg, ext4_fsblk_t blk)
 {
-	bg->bg_inode_bitmap  = cpu_to_le32((u32)blk);
+	bg->bg_inode_bitmap_lo  = cpu_to_le32((u32)blk);
 	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 		bg->bg_inode_bitmap_hi = cpu_to_le32(blk >> 32);
 }
@@ -110,7 +110,7 @@ void ext4_inode_bitmap_set(struct super_block *sb,
 void ext4_inode_table_set(struct super_block *sb,
 			  struct ext4_group_desc *bg, ext4_fsblk_t blk)
 {
-	bg->bg_inode_table = cpu_to_le32((u32)blk);
+	bg->bg_inode_table_lo = cpu_to_le32((u32)blk);
 	if (EXT4_DESC_SIZE(sb) >= EXT4_MIN_DESC_SIZE_64BIT)
 		bg->bg_inode_table_hi = cpu_to_le32(blk >> 32);
 }

include/linux/ext4_fs.h

@@ -106,8 +106,8 @@
 struct ext4_group_desc
 {
 	__le32	bg_block_bitmap_lo;	/* Blocks bitmap block */
-	__le32	bg_inode_bitmap;	/* Inodes bitmap block */
-	__le32	bg_inode_table;		/* Inodes table block */
+	__le32	bg_inode_bitmap_lo;	/* Inodes bitmap block */
+	__le32	bg_inode_table_lo;	/* Inodes table block */
 	__le16	bg_free_blocks_count;	/* Free blocks count */
 	__le16	bg_free_inodes_count;	/* Free inodes count */
 	__le16	bg_used_dirs_count;	/* Directories count */