Btrfs: Fix 32 bit compiles by using an unsigned long byte count in th…

…e ordered extent

The ordered extents have to fit in memory, so an unsigned long is sufficient.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

fs/btrfs/ordered-data.h

@@ -95,7 +95,8 @@ struct btrfs_ordered_extent {
  * calculates the total size you need to allocate for an ordered sum
  * structure spanning 'bytes' in the file
  */
-static inline int btrfs_ordered_sum_size(struct btrfs_root *root, u64 bytes)
+static inline int btrfs_ordered_sum_size(struct btrfs_root *root,
+					 unsigned long bytes)
 {
 	unsigned long num_sectors = (bytes + root->sectorsize - 1) /
 		root->sectorsize;