journal_entry_tag
char *tag_ptr = journal_entry_tag(ic, je);
memcpy(journal_entry_tag(ic, je), checksums_onstack, ic->tag_size);
integrity_sector_checksum(ic, &dio->ahash_req, logical_sector, js_page, js_offset, journal_entry_tag(ic, je));
if (unlikely(crypto_memneq(test_tag, journal_entry_tag(ic, je2), ic->tag_size))) {
r = dm_integrity_rw_tag(ic, journal_entry_tag(ic, je2), &metadata_block, &metadata_offset,