ceph: use truncate_pagecache() instead of truncate_inode_pages()

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>

fs/ceph/inode.c

@@ -1546,7 +1546,7 @@ static void ceph_invalidate_work(struct work_struct *work)
 	orig_gen = ci->i_rdcache_gen;
 	spin_unlock(&ci->i_ceph_lock);
 
-	truncate_inode_pages(inode->i_mapping, 0);
+	truncate_pagecache(inode, 0);
 
 	spin_lock(&ci->i_ceph_lock);
 	if (orig_gen == ci->i_rdcache_gen &&
@@ -1649,7 +1649,7 @@ retry:
 	     ci->i_truncate_pending, to);
 	spin_unlock(&ci->i_ceph_lock);
 
-	truncate_inode_pages(inode->i_mapping, to);
+	truncate_pagecache(inode, to);
 
 	spin_lock(&ci->i_ceph_lock);
 	if (to == ci->i_truncate_size) {