Revert "ext4: make mb_optimize_scan performance mount option work with extents"

This reverts commit 3c65b73.

The reverted commit is likely to also be reverted upstream, but with a
performance regression like this I don't want to wait for that.

See: #5097

Signed-off-by: Phil Elwell <[email protected]>

Author: pelwell

fs/ext4/mballoc.c

@@ -1000,7 +1000,7 @@ static inline int should_optimize_scan(struct ext4_allocation_context *ac)
 		return 0;
 	if (ac->ac_criteria >= 2)
 		return 0;
-	if (!ext4_test_inode_flag(ac->ac_inode, EXT4_INODE_EXTENTS))
+	if (ext4_test_inode_flag(ac->ac_inode, EXT4_INODE_EXTENTS))
 		return 0;
 	return 1;
 }