+ struct bch_fs *c = trans->c;
+ struct reflink_gc *r;
+ int add = !(flags & BTREE_TRIGGER_OVERWRITE) ? 1 : -1;
+ u64 start = le64_to_cpu(p.v->idx);
+ u64 end = le64_to_cpu(p.v->idx) + p.k->size;
+ u64 next_idx = end + le32_to_cpu(p.v->back_pad);
+ s64 ret = 0;
+ struct printbuf buf = PRINTBUF;
+
+ if (r_idx >= c->reflink_gc_nr)
+ goto not_found;
+
+ r = genradix_ptr(&c->reflink_gc_table, r_idx);
+ next_idx = min(next_idx, r->offset - r->size);
+ if (*idx < next_idx)
+ goto not_found;
+
+ BUG_ON((s64) r->refcount + add < 0);
+
+ r->refcount += add;
+ *idx = r->offset;
+ return 0;
+not_found:
+ if (fsck_err(c, reflink_p_to_missing_reflink_v,
+ "pointer to missing indirect extent\n"
+ " %s\n"
+ " missing range %llu-%llu",
+ (bch2_bkey_val_to_text(&buf, c, p.s_c), buf.buf),
+ *idx, next_idx)) {
+ struct bkey_i *update = bch2_bkey_make_mut_noupdate(trans, p.s_c);
+ ret = PTR_ERR_OR_ZERO(update);
+ if (ret)
+ goto err;
+
+ if (next_idx <= start) {
+ bkey_i_to_reflink_p(update)->v.front_pad = cpu_to_le32(start - next_idx);
+ } else if (*idx >= end) {
+ bkey_i_to_reflink_p(update)->v.back_pad = cpu_to_le32(*idx - end);
+ } else {
+ bkey_error_init(update);
+ update->k.p = p.k->p;
+ update->k.p.offset = next_idx;
+ update->k.size = next_idx - *idx;
+ set_bkey_val_u64s(&update->k, 0);
+ }
+
+ ret = bch2_btree_insert_trans(trans, BTREE_ID_extents, update, BTREE_TRIGGER_NORUN);
+ }
+
+ *idx = next_idx;
+err:
+fsck_err:
+ printbuf_exit(&buf);
+ return ret;
+}
+
+static int __trigger_reflink_p(struct btree_trans *trans,
+ enum btree_id btree_id, unsigned level,
+ struct bkey_s_c k, unsigned flags)
+{
+ struct bch_fs *c = trans->c;
+ struct bkey_s_c_reflink_p p = bkey_s_c_to_reflink_p(k);
+ int ret = 0;
+
+ u64 idx = le64_to_cpu(p.v->idx) - le32_to_cpu(p.v->front_pad);
+ u64 end = le64_to_cpu(p.v->idx) + p.k->size + le32_to_cpu(p.v->back_pad);
+
+ if (flags & BTREE_TRIGGER_TRANSACTIONAL) {
+ while (idx < end && !ret)
+ ret = trans_trigger_reflink_p_segment(trans, p, &idx, flags);
+ }
+
+ if (flags & BTREE_TRIGGER_GC) {
+ size_t l = 0, r = c->reflink_gc_nr;
+
+ while (l < r) {
+ size_t m = l + (r - l) / 2;
+ struct reflink_gc *ref = genradix_ptr(&c->reflink_gc_table, m);
+ if (ref->offset <= idx)
+ l = m + 1;
+ else
+ r = m;
+ }
+
+ while (idx < end && !ret)
+ ret = gc_trigger_reflink_p_segment(trans, p, &idx, flags, l++);
+ }
+
+ return ret;
+}