ceph_fscrypt_pagecache_page
page = ceph_fscrypt_pagecache_page(ceph_wbc->pages[i]);
page = ceph_fscrypt_pagecache_page(ceph_wbc->pages[i]);
snapc = page_snap_context(ceph_fscrypt_pagecache_page(page));
return page_offset(ceph_fscrypt_pagecache_page(page));