- /* it can't be one of the bitmap blocks */
- for (i = 0; i < SB_BMAP_NR(s); i++)
- if (block == SB_AP_BITMAP(s)[i].bh->b_blocknr) {
+ get_bit_address(s, block, &bmap, &offset);
+
+ /* Old format filesystem? Unlikely, but the bitmaps are all up front so
+ * we need to account for it. */
+ if (unlikely(test_bit(REISERFS_OLD_FORMAT,
+ &(REISERFS_SB(s)->s_properties)))) {
+ b_blocknr_t bmap1 = REISERFS_SB(s)->s_sbh->b_blocknr + 1;
+ if (block >= bmap1 && block <= bmap1 + SB_BMAP_NR(s)) {
+ reiserfs_warning(s, "vs: 4019: is_reusable: "
+ "bitmap block %lu(%u) can't be freed or reused",
+ block, SB_BMAP_NR(s));
+ return 0;
+ }
+ } else {
+ if (offset == 0) {