iomap: return VM_FAULT_* codes from iomap_page_mkwrite

All callers will need the VM_FAULT_* flags, so convert in the helper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
diff --git a/fs/iomap.c b/fs/iomap.c
index 59cc98a..8554a8d 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -477,10 +477,10 @@
 
 	set_page_dirty(page);
 	wait_for_stable_page(page);
-	return 0;
+	return VM_FAULT_LOCKED;
 out_unlock:
 	unlock_page(page);
-	return ret;
+	return block_page_mkwrite_return(ret);
 }
 EXPORT_SYMBOL_GPL(iomap_page_mkwrite);