+
+/*
+ * Return (in *dasizep) the amount of space on the deadlist which is:
+ * mintxg < blk_birth <= maxtxg
+ */
+int
+bplist_space_birthrange(bplist_t *bpl, uint64_t mintxg, uint64_t maxtxg,
+ uint64_t *dasizep)
+{
+ uint64_t size = 0;
+ uint64_t itor = 0;
+ blkptr_t bp;
+ int err;
+
+ /*
+ * As an optimization, if they want the whole txg range, just
+ * get bpl_bytes rather than iterating over the bps.
+ */
+ if (mintxg < TXG_INITIAL && maxtxg == UINT64_MAX) {
+ mutex_enter(&bpl->bpl_lock);
+ err = bplist_hold(bpl);
+ if (err == 0)
+ *dasizep = bpl->bpl_phys->bpl_bytes;
+ mutex_exit(&bpl->bpl_lock);
+ return (err);
+ }
+
+ while ((err = bplist_iterate(bpl, &itor, &bp)) == 0) {
+ if (bp.blk_birth > mintxg && bp.blk_birth <= maxtxg) {
+ size +=
+ bp_get_dasize(dmu_objset_spa(bpl->bpl_mos), &bp);
+ }
+ }
+ if (err == ENOENT)
+ err = 0;
+ *dasizep = size;
+ return (err);
+}