nilfs2: unify type of key arguments in bmap interface

The type of key arguments in block mapping interface varies depending
on function.  For instance, nilfs_bmap_lookup_at_level() takes "__u64"
for its key argument whereas nilfs_bmap_lookup() takes "unsigned
long".

This fits them to "__u64" to eliminate the variation.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index ab4987b..07577cb 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -106,7 +106,7 @@
 		err = nilfs_transaction_begin(inode->i_sb, &ti, 1);
 		if (unlikely(err))
 			goto out;
-		err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff,
+		err = nilfs_bmap_insert(ii->i_bmap, blkoff,
 					(unsigned long)bh_result);
 		if (unlikely(err != 0)) {
 			if (err == -EEXIST) {
@@ -714,7 +714,7 @@
 static void nilfs_truncate_bmap(struct nilfs_inode_info *ii,
 				unsigned long from)
 {
-	unsigned long b;
+	__u64 b;
 	int ret;
 
 	if (!test_bit(NILFS_I_BMAP, &ii->i_state))
@@ -729,7 +729,7 @@
 	if (b < from)
 		return;
 
-	b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
+	b -= min_t(__u64, NILFS_MAX_TRUNCATE_BLOCKS, b - from);
 	ret = nilfs_bmap_truncate(ii->i_bmap, b);
 	nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb);
 	if (!ret || (ret == -ENOMEM &&