btrfs: open code trivial helper btrfs_page_exists_in_range

The called function name is self explanatory.
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/btrfs_inode.h

@@ -364,10 +364,4 @@ static inline void btrfs_print_data_csum_error(struct btrfs_inode *inode,
 			logical_start, csum, csum_expected, mirror_num);
 }
 
-static inline bool btrfs_page_exists_in_range(struct inode *inode,
-						loff_t start, loff_t end)
-{
-	return filemap_range_has_page(inode->i_mapping, start, end);
-}
-
 #endif

fs/btrfs/file.c

@@ -2482,7 +2482,8 @@ static int btrfs_punch_hole_lock_range(struct inode *inode,
 		if ((!ordered ||
 		    (ordered->file_offset + ordered->len <= lockstart ||
 		     ordered->file_offset > lockend)) &&
-		     !btrfs_page_exists_in_range(inode, lockstart, lockend)) {
+		     !filemap_range_has_page(inode->i_mapping,
+					     lockstart, lockend)) {
 			if (ordered)
 				btrfs_put_ordered_extent(ordered);
 			break;

fs/btrfs/inode.c

@@ -7489,8 +7489,8 @@ static int lock_extent_direct(struct inode *inode, u64 lockstart, u64 lockend,
 		 * get stale data.
 		 */
 		if (!ordered &&
-		    (!writing ||
-		     !btrfs_page_exists_in_range(inode, lockstart, lockend)))
+		    (!writing || !filemap_range_has_page(inode->i_mapping,
+							 lockstart, lockend)))
 			break;
 
 		unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend,