btrfs: use min() to replace open-code in btrfs_invalidatepage()

In btrfs_invalidatepage() we introduce a temporary variable, new_len, to
update ordered->truncated_len.  But we can use min() to replace it
completely and no need for the variable.

Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 1e0e20a..18408b9 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -8414,15 +8414,13 @@ again:
                 */
                if (TestClearPagePrivate2(page)) {
                        struct btrfs_ordered_inode_tree *tree;
-                       u64 new_len;
 
                        tree = &inode->ordered_tree;
 
                        spin_lock_irq(&tree->lock);
                        set_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags);
-                       new_len = start - ordered->file_offset;
-                       if (new_len < ordered->truncated_len)
-                               ordered->truncated_len = new_len;
+                       ordered->truncated_len = min(ordered->truncated_len,
+                                                    start - ordered->file_offset);
                        spin_unlock_irq(&tree->lock);
 
                        if (btrfs_dec_test_ordered_pending(inode, &ordered,