+#ifdef CONFIG_JFFS2_FS_XATTR
+static int jffs2_scan_xattr_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
+ struct jffs2_raw_xattr *rx, uint32_t ofs,
+ struct jffs2_summary *s)
+{
+ struct jffs2_xattr_datum *xd;
+ uint32_t xid, version, totlen, crc;
+ int err;
+
+ crc = crc32(0, rx, sizeof(struct jffs2_raw_xattr) - 4);
+ if (crc != je32_to_cpu(rx->node_crc)) {
+ JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
+ ofs, je32_to_cpu(rx->node_crc), crc);
+ if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen))))
+ return err;
+ return 0;
+ }
+
+ xid = je32_to_cpu(rx->xid);
+ version = je32_to_cpu(rx->version);
+
+ totlen = PAD(sizeof(struct jffs2_raw_xattr)
+ + rx->name_len + 1 + je16_to_cpu(rx->value_len));
+ if (totlen != je32_to_cpu(rx->totlen)) {
+ JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%u\n",
+ ofs, je32_to_cpu(rx->totlen), totlen);
+ if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rx->totlen))))
+ return err;
+ return 0;
+ }
+
+ xd = jffs2_setup_xattr_datum(c, xid, version);
+ if (IS_ERR(xd))
+ return PTR_ERR(xd);
+
+ if (xd->version > version) {
+ struct jffs2_raw_node_ref *raw
+ = jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, NULL);
+ raw->next_in_ino = xd->node->next_in_ino;
+ xd->node->next_in_ino = raw;
+ } else {
+ xd->version = version;
+ xd->xprefix = rx->xprefix;
+ xd->name_len = rx->name_len;
+ xd->value_len = je16_to_cpu(rx->value_len);
+ xd->data_crc = je32_to_cpu(rx->data_crc);
+
+ jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, totlen, (void *)xd);
+ }
+
+ if (jffs2_sum_active())
+ jffs2_sum_add_xattr_mem(s, rx, ofs - jeb->offset);
+ dbg_xattr("scaning xdatum at %#08x (xid=%u, version=%u)\n",
+ ofs, xd->xid, xd->version);
+ return 0;
+}
+
+static int jffs2_scan_xref_node(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
+ struct jffs2_raw_xref *rr, uint32_t ofs,
+ struct jffs2_summary *s)
+{
+ struct jffs2_xattr_ref *ref;
+ uint32_t crc;
+ int err;
+
+ crc = crc32(0, rr, sizeof(*rr) - 4);
+ if (crc != je32_to_cpu(rr->node_crc)) {
+ JFFS2_WARNING("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
+ ofs, je32_to_cpu(rr->node_crc), crc);
+ if ((err = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(rr->totlen)))))
+ return err;
+ return 0;
+ }
+
+ if (PAD(sizeof(struct jffs2_raw_xref)) != je32_to_cpu(rr->totlen)) {
+ JFFS2_WARNING("node length mismatch at %#08x, read=%u, calc=%zd\n",
+ ofs, je32_to_cpu(rr->totlen),
+ PAD(sizeof(struct jffs2_raw_xref)));
+ if ((err = jffs2_scan_dirty_space(c, jeb, je32_to_cpu(rr->totlen))))
+ return err;
+ return 0;
+ }
+
+ ref = jffs2_alloc_xattr_ref();
+ if (!ref)
+ return -ENOMEM;
+
+ /* BEFORE jffs2_build_xattr_subsystem() called,
+ * and AFTER xattr_ref is marked as a dead xref,
+ * ref->xid is used to store 32bit xid, xd is not used
+ * ref->ino is used to store 32bit inode-number, ic is not used
+ * Thoes variables are declared as union, thus using those
+ * are exclusive. In a similar way, ref->next is temporarily
+ * used to chain all xattr_ref object. It's re-chained to
+ * jffs2_inode_cache in jffs2_build_xattr_subsystem() correctly.
+ */
+ ref->ino = je32_to_cpu(rr->ino);
+ ref->xid = je32_to_cpu(rr->xid);
+ ref->xseqno = je32_to_cpu(rr->xseqno);
+ if (ref->xseqno > c->highest_xseqno)
+ c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER);
+ ref->next = c->xref_temp;
+ c->xref_temp = ref;
+
+ jffs2_link_node_ref(c, jeb, ofs | REF_PRISTINE, PAD(je32_to_cpu(rr->totlen)), (void *)ref);
+
+ if (jffs2_sum_active())
+ jffs2_sum_add_xref_mem(s, rr, ofs - jeb->offset);
+ dbg_xattr("scan xref at %#08x (xid=%u, ino=%u)\n",
+ ofs, ref->xid, ref->ino);
+ return 0;
+}
+#endif
+
+/* Called with 'buf_size == 0' if buf is in fact a pointer _directly_ into
+ the flash, XIP-style */