exfat: reuse exfat_inode_info variable instead of calling EXFAT_I()

Also add a local "struct exfat_inode_info *ei" variable to
exfat_truncate() to simplify the code.

Signed-off-by: Christophe Vu-Brugier <christophe.vu-brugier@seagate.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

fs/exfat/file.c

@@ -110,8 +110,7 @@ int __exfat_truncate(struct inode *inode, loff_t new_size)
 	exfat_set_volume_dirty(sb);
 
 	num_clusters_new = EXFAT_B_TO_CLU_ROUND_UP(i_size_read(inode), sbi);
-	num_clusters_phys =
-		EXFAT_B_TO_CLU_ROUND_UP(EXFAT_I(inode)->i_size_ondisk, sbi);
+	num_clusters_phys = EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi);
 
 	exfat_chain_set(&clu, ei->start_clu, num_clusters_phys, ei->flags);
 
@@ -228,12 +227,13 @@ void exfat_truncate(struct inode *inode, loff_t size)
 {
 	struct super_block *sb = inode->i_sb;
 	struct exfat_sb_info *sbi = EXFAT_SB(sb);
+	struct exfat_inode_info *ei = EXFAT_I(inode);
 	unsigned int blocksize = i_blocksize(inode);
 	loff_t aligned_size;
 	int err;
 
 	mutex_lock(&sbi->s_lock);
-	if (EXFAT_I(inode)->start_clu == 0) {
+	if (ei->start_clu == 0) {
 		/*
 		 * Empty start_clu != ~0 (not allocated)
 		 */
@@ -260,11 +260,11 @@ void exfat_truncate(struct inode *inode, loff_t size)
 		aligned_size++;
 	}
 
-	if (EXFAT_I(inode)->i_size_ondisk > i_size_read(inode))
-		EXFAT_I(inode)->i_size_ondisk = aligned_size;
+	if (ei->i_size_ondisk > i_size_read(inode))
+		ei->i_size_ondisk = aligned_size;
 
-	if (EXFAT_I(inode)->i_size_aligned > i_size_read(inode))
-		EXFAT_I(inode)->i_size_aligned = aligned_size;
+	if (ei->i_size_aligned > i_size_read(inode))
+		ei->i_size_aligned = aligned_size;
 	mutex_unlock(&sbi->s_lock);
 }
 

fs/exfat/inode.c

@@ -114,10 +114,9 @@ static int exfat_map_cluster(struct inode *inode, unsigned int clu_offset,
 	unsigned int local_clu_offset = clu_offset;
 	unsigned int num_to_be_allocated = 0, num_clusters = 0;
 
-	if (EXFAT_I(inode)->i_size_ondisk > 0)
+	if (ei->i_size_ondisk > 0)
 		num_clusters =
-			EXFAT_B_TO_CLU_ROUND_UP(EXFAT_I(inode)->i_size_ondisk,
-			sbi);
+			EXFAT_B_TO_CLU_ROUND_UP(ei->i_size_ondisk, sbi);
 
 	if (clu_offset >= num_clusters)
 		num_to_be_allocated = clu_offset - num_clusters + 1;
@@ -416,10 +415,10 @@ static int exfat_write_end(struct file *file, struct address_space *mapping,
 
 	err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
 
-	if (EXFAT_I(inode)->i_size_aligned < i_size_read(inode)) {
+	if (ei->i_size_aligned < i_size_read(inode)) {
 		exfat_fs_error(inode->i_sb,
 			"invalid size(size(%llu) > aligned(%llu)\n",
-			i_size_read(inode), EXFAT_I(inode)->i_size_aligned);
+			i_size_read(inode), ei->i_size_aligned);
 		return -EIO;
 	}
 

fs/exfat/namei.c

@@ -395,9 +395,9 @@ static int exfat_find_empty_entry(struct inode *inode,
 
 		/* directory inode should be updated in here */
 		i_size_write(inode, size);
-		EXFAT_I(inode)->i_size_ondisk += sbi->cluster_size;
-		EXFAT_I(inode)->i_size_aligned += sbi->cluster_size;
-		EXFAT_I(inode)->flags = p_dir->flags;
+		ei->i_size_ondisk += sbi->cluster_size;
+		ei->i_size_aligned += sbi->cluster_size;
+		ei->flags = p_dir->flags;
 		inode->i_blocks += 1 << sbi->sect_per_clus_bits;
 	}
 

fs/exfat/super.c

@@ -366,9 +366,9 @@ static int exfat_read_root(struct inode *inode)
 
 	inode->i_blocks = ((i_size_read(inode) + (sbi->cluster_size - 1))
 			& ~(sbi->cluster_size - 1)) >> inode->i_blkbits;
-	EXFAT_I(inode)->i_pos = ((loff_t)sbi->root_dir << 32) | 0xffffffff;
-	EXFAT_I(inode)->i_size_aligned = i_size_read(inode);
-	EXFAT_I(inode)->i_size_ondisk = i_size_read(inode);
+	ei->i_pos = ((loff_t)sbi->root_dir << 32) | 0xffffffff;
+	ei->i_size_aligned = i_size_read(inode);
+	ei->i_size_ondisk = i_size_read(inode);
 
 	exfat_save_attr(inode, ATTR_SUBDIR);
 	inode->i_mtime = inode->i_atime = inode->i_ctime = ei->i_crtime =