ext4: use 'sbi' instead of 'EXT4_SB(sb)'

We could use 'sbi' instead of 'EXT4_SB(sb)' to make code more elegant.

Signed-off-by: Jun Piao <[e-mail]>
Signed-off-by: Theodore Ts'o <[e-mail]>
Reviewed-by: Jan Kara <[e-mail]>

fs/ext4/balloc.c

···
 	blk = ext4_inode_table(sb, desc);
 	offset = blk - group_first_block;
 	next_zero_bit = ext4_find_next_zero_bit(bh->b_data,
-			EXT4_B2C(sbi, offset + EXT4_SB(sb)->s_itb_per_group),
+			EXT4_B2C(sbi, offset + sbi->s_itb_per_group),
 			EXT4_B2C(sbi, offset));
 	if (next_zero_bit <
-	    EXT4_B2C(sbi, offset + EXT4_SB(sb)->s_itb_per_group))
+	    EXT4_B2C(sbi, offset + sbi->s_itb_per_group))
 		/* bad bitmap for inode tables */
 		return blk;
 	return 0;

fs/ext4/block_validity.c

···
 	int ret;
 
 	if (!test_opt(sb, BLOCK_VALIDITY)) {
-		if (EXT4_SB(sb)->system_blks.rb_node)
+		if (sbi->system_blks.rb_node)
 			ext4_release_system_zone(sb);
 		return 0;
 	}
-	if (EXT4_SB(sb)->system_blks.rb_node)
+	if (sbi->system_blks.rb_node)
 		return 0;
 
 	for (i=0; i < ngroups; i++) {
···
 	}
 
 	if (test_opt(sb, DEBUG))
-		debug_print_tree(EXT4_SB(sb));
+		debug_print_tree(sbi);
 	return 0;
 }
 

fs/ext4/ialloc.c

···
 	/* Do this BEFORE marking the inode not in use or returning an error */
 	ext4_clear_inode(inode);
 
-	es = EXT4_SB(sb)->s_es;
+	es = sbi->s_es;
 	if (ino < EXT4_FIRST_INO(sb) || ino > le32_to_cpu(es->s_inodes_count)) {
 		ext4_error(sb, "reserved or nonexistent inode %lu", ino);
 		goto error_return;
···
 	ext4_clear_state_flags(ei); /* Only relevant on 32-bit archs */
 	ext4_set_inode_state(inode, EXT4_STATE_NEW);
 
-	ei->i_extra_isize = EXT4_SB(sb)->s_want_extra_isize;
+	ei->i_extra_isize = sbi->s_want_extra_isize;
 	ei->i_inline_off = 0;
 	if (ext4_has_feature_inline_data(sb))
 		ext4_set_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA);

fs/ext4/mballoc.c

···
 	clear_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &(grp->bb_state));
 
 	period = get_cycles() - period;
-	spin_lock(&EXT4_SB(sb)->s_bal_lock);
-	EXT4_SB(sb)->s_mb_buddies_generated++;
-	EXT4_SB(sb)->s_mb_generation_time += period;
-	spin_unlock(&EXT4_SB(sb)->s_bal_lock);
+	spin_lock(&sbi->s_bal_lock);
+	sbi->s_mb_buddies_generated++;
+	sbi->s_mb_generation_time += period;
+	spin_unlock(&sbi->s_bal_lock);
 }
 
 static void mb_regenerate_buddy(struct ext4_buddy *e4b)
···
 		ext4_fsblk_t blocknr;
 
 		blocknr = ext4_group_first_block_no(sb, e4b->bd_group);
-		blocknr += EXT4_C2B(EXT4_SB(sb), block);
+		blocknr += EXT4_C2B(sbi, block);
 		ext4_grp_locked_error(sb, e4b->bd_group,
 				      inode ? inode->i_ino : 0,
 				      blocknr,
···
 	if (in_range(ext4_block_bitmap(sb, gdp), block, count) ||
 	    in_range(ext4_inode_bitmap(sb, gdp), block, count) ||
 	    in_range(block, ext4_inode_table(sb, gdp),
-		     EXT4_SB(sb)->s_itb_per_group) ||
+		     sbi->s_itb_per_group) ||
 	    in_range(block + count - 1, ext4_inode_table(sb, gdp),
-		     EXT4_SB(sb)->s_itb_per_group)) {
+		     sbi->s_itb_per_group)) {
 
 		ext4_error(sb, "Freeing blocks in system zone - "
 			   "Block = %llu, count = %lu", block, count);

fs/ext4/resize.c

···
 		goto exit_journal;
 
 	group = flex_gd->groups[0].group;
-	BUG_ON(group != EXT4_SB(sb)->s_groups_count);
+	BUG_ON(group != sbi->s_groups_count);
 	err = ext4_add_new_descs(handle, sb, group,
 				resize_inode, flex_gd->count);
 	if (err)

fs/ext4/super.c

···
 	 * compensate.
 	 */
 	if (sb->s_blocksize == 1024 && nr == 0 &&
-	    le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block) == 0)
+	    le32_to_cpu(sbi->s_es->s_first_data_block) == 0)
 		has_super++;
 
 	return (has_super + ext4_group_first_block_no(sb, bg));
···
 {
 	struct ext4_sb_info *sbi = EXT4_SB(sb);
 	struct ext4_li_request *elr = NULL;
-	ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
+	ext4_group_t ngroups = sbi->s_groups_count;
 	int ret = 0;
 
 	mutex_lock(&ext4_li_mtx);
···
 	bool needs_barrier = false;
 	struct ext4_sb_info *sbi = EXT4_SB(sb);
 
-	if (unlikely(ext4_forced_shutdown(EXT4_SB(sb))))
+	if (unlikely(ext4_forced_shutdown(sbi)))
 		return 0;
 
 	trace_ext4_sync_fs(sb, wait);