ext4: remove unused code from ext4_remove_blocks()

The "head removal" branch in the condition is never used in any code
path in ext4 since the function only caller ext4_ext_rm_leaf() will make
sure that the extent is properly split before removing blocks. Note that
there is a bug in this branch anyway.

This commit removes the unused code completely and makes use of
ext4_error() instead of printk if dubious range is provided.
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

fs/ext4/extents.c

@@ -2432,23 +2432,10 @@ static int ext4_remove_blocks(handle_t *handle, struct inode *inode,
 			*partial_cluster = EXT4_B2C(sbi, pblk);
 		else
 			*partial_cluster = 0;
-	} else if (from == le32_to_cpu(ex->ee_block)
-		   && to <= le32_to_cpu(ex->ee_block) + ee_len - 1) {
-		/* head removal */
-		ext4_lblk_t num;
-		ext4_fsblk_t start;
-
-		num = to - from;
-		start = ext4_ext_pblock(ex);
-
-		ext_debug("free first %u blocks starting %llu\n", num, start);
-		ext4_free_blocks(handle, inode, NULL, start, num, flags);
-
-	} else {
-		printk(KERN_INFO "strange request: removal(2) "
+	} else
+		ext4_error(sbi->s_sb, "strange request: removal(2) "
 			   "%u-%u from %u:%u\n",
 			   from, to, le32_to_cpu(ex->ee_block), ee_len);
-	}
 	return 0;
 }