diff --git a/block.c b/block.c
index af3faf664e..2e3905c99e 100644
--- a/block.c
+++ b/block.c
@@ -2617,6 +2617,7 @@ BdrvChild *bdrv_root_attach_child(BlockDriverState *child_bs,
             error_propagate(errp, local_err);
             g_free(child);
             bdrv_abort_perm_update(child_bs);
+            bdrv_unref(child_bs);
             return NULL;
         }
     }
diff --git a/block/iscsi.c b/block/iscsi.c
index 14680a436a..4e216bd8aa 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -2002,7 +2002,7 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
         iscsilun->cluster_size = iscsilun->bl.opt_unmap_gran *
             iscsilun->block_size;
         if (iscsilun->lbprz) {
-            ret = iscsi_allocmap_init(iscsilun, bs->open_flags);
+            ret = iscsi_allocmap_init(iscsilun, flags);
         }
     }
 
diff --git a/block/mirror.c b/block/mirror.c
index 6203e5946e..c26fd9260d 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -102,6 +102,7 @@ struct MirrorOp {
 
     bool is_pseudo_op;
     bool is_active_write;
+    bool is_in_flight;
     CoQueue waiting_requests;
     Coroutine *co;
 
@@ -283,20 +284,19 @@ static int mirror_cow_align(MirrorBlockJob *s, int64_t *offset,
 }
 
 static inline void coroutine_fn
-mirror_wait_for_any_operation(MirrorBlockJob *s, MirrorOp *self, bool active)
+mirror_wait_for_any_operation(MirrorBlockJob *s, bool active)
 {
     MirrorOp *op;
 
     QTAILQ_FOREACH(op, &s->ops_in_flight, next) {
-        if (self == op) {
-            continue;
-        }
         /* Do not wait on pseudo ops, because it may in turn wait on
          * some other operation to start, which may in fact be the
          * caller of this function.  Since there is only one pseudo op
          * at any given time, we will always find some real operation
          * to wait on. */
-        if (!op->is_pseudo_op && op->is_active_write == active) {
+        if (!op->is_pseudo_op && op->is_in_flight &&
+            op->is_active_write == active)
+        {
             qemu_co_queue_wait(&op->waiting_requests, NULL);
             return;
         }
@@ -305,10 +305,10 @@ mirror_wait_for_any_operation(MirrorBlockJob *s, MirrorOp *self, bool active)
 }
 
 static inline void coroutine_fn
-mirror_wait_for_free_in_flight_slot(MirrorBlockJob *s, MirrorOp *self)
+mirror_wait_for_free_in_flight_slot(MirrorBlockJob *s)
 {
     /* Only non-active operations use up in-flight slots */
-    mirror_wait_for_any_operation(s, self, false);
+    mirror_wait_for_any_operation(s, false);
 }
 
 /* Perform a mirror copy operation.
@@ -351,7 +351,7 @@ static void coroutine_fn mirror_co_read(void *opaque)
 
     while (s->buf_free_count < nb_chunks) {
         trace_mirror_yield_in_flight(s, op->offset, s->in_flight);
-        mirror_wait_for_free_in_flight_slot(s, op);
+        mirror_wait_for_free_in_flight_slot(s);
     }
 
     /* Now make a QEMUIOVector taking enough granularity-sized chunks
@@ -370,6 +370,7 @@ static void coroutine_fn mirror_co_read(void *opaque)
     /* Copy the dirty cluster.  */
     s->in_flight++;
     s->bytes_in_flight += op->bytes;
+    op->is_in_flight = true;
     trace_mirror_one_iteration(s, op->offset, op->bytes);
 
     ret = bdrv_co_preadv(s->mirror_top_bs->backing, op->offset, op->bytes,
@@ -385,6 +386,7 @@ static void coroutine_fn mirror_co_zero(void *opaque)
     op->s->in_flight++;
     op->s->bytes_in_flight += op->bytes;
     *op->bytes_handled = op->bytes;
+    op->is_in_flight = true;
 
     ret = blk_co_pwrite_zeroes(op->s->target, op->offset, op->bytes,
                                op->s->unmap ? BDRV_REQ_MAY_UNMAP : 0);
@@ -399,6 +401,7 @@ static void coroutine_fn mirror_co_discard(void *opaque)
     op->s->in_flight++;
     op->s->bytes_in_flight += op->bytes;
     *op->bytes_handled = op->bytes;
+    op->is_in_flight = true;
 
     ret = blk_co_pdiscard(op->s->target, op->offset, op->bytes);
     mirror_write_complete(op, ret);
@@ -558,7 +561,7 @@ static uint64_t coroutine_fn mirror_iteration(MirrorBlockJob *s)
 
         while (s->in_flight >= MAX_IN_FLIGHT) {
             trace_mirror_yield_in_flight(s, offset, s->in_flight);
-            mirror_wait_for_free_in_flight_slot(s, pseudo_op);
+            mirror_wait_for_free_in_flight_slot(s);
         }
 
         if (s->ret < 0) {
@@ -612,7 +615,7 @@ static void mirror_free_init(MirrorBlockJob *s)
 static void coroutine_fn mirror_wait_for_all_io(MirrorBlockJob *s)
 {
     while (s->in_flight > 0) {
-        mirror_wait_for_free_in_flight_slot(s, NULL);
+        mirror_wait_for_free_in_flight_slot(s);
     }
 }
 
@@ -810,7 +813,7 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
             if (s->in_flight >= MAX_IN_FLIGHT) {
                 trace_mirror_yield(s, UINT64_MAX, s->buf_free_count,
                                    s->in_flight);
-                mirror_wait_for_free_in_flight_slot(s, NULL);
+                mirror_wait_for_free_in_flight_slot(s);
                 continue;
             }
 
@@ -963,7 +966,7 @@ static int coroutine_fn mirror_run(Job *job, Error **errp)
         /* Do not start passive operations while there are active
          * writes in progress */
         while (s->in_active_write_counter) {
-            mirror_wait_for_any_operation(s, NULL, true);
+            mirror_wait_for_any_operation(s, true);
         }
 
         if (s->ret < 0) {
@@ -989,7 +992,7 @@ static int coroutine_fn mirror_run(Job *job, Error **errp)
             if (s->in_flight >= MAX_IN_FLIGHT || s->buf_free_count == 0 ||
                 (cnt == 0 && s->in_flight > 0)) {
                 trace_mirror_yield(s, cnt, s->buf_free_count, s->in_flight);
-                mirror_wait_for_free_in_flight_slot(s, NULL);
+                mirror_wait_for_free_in_flight_slot(s);
                 continue;
             } else if (cnt != 0) {
                 delay_ns = mirror_iteration(s);
@@ -1322,6 +1325,7 @@ static MirrorOp *coroutine_fn active_write_prepare(MirrorBlockJob *s,
         .offset             = offset,
         .bytes              = bytes,
         .is_active_write    = true,
+        .is_in_flight       = true,
     };
     qemu_co_queue_init(&op->waiting_requests);
     QTAILQ_INSERT_TAIL(&s->ops_in_flight, op, next);
diff --git a/block/qcow2.h b/block/qcow2.h
index 0942126232..f4de0a27d5 100644
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -301,9 +301,6 @@ typedef struct BDRVQcow2State {
     QEMUTimer *cache_clean_timer;
     unsigned cache_clean_interval;
 
-    uint8_t *cluster_cache;
-    uint8_t *cluster_data;
-    uint64_t cluster_cache_offset;
     QLIST_HEAD(, QCowL2Meta) cluster_allocs;
 
     uint64_t *refcount_table;
diff --git a/hw/block/trace-events b/hw/block/trace-events
index f78939fa9d..bf6d11b58b 100644
--- a/hw/block/trace-events
+++ b/hw/block/trace-events
@@ -37,7 +37,7 @@ nvme_rw(const char *verb, uint32_t blk_count, uint64_t byte_count, uint64_t lba)
 nvme_create_sq(uint64_t addr, uint16_t sqid, uint16_t cqid, uint16_t qsize, uint16_t qflags) "create submission queue, addr=0x%"PRIx64", sqid=%"PRIu16", cqid=%"PRIu16", qsize=%"PRIu16", qflags=%"PRIu16""
 nvme_create_cq(uint64_t addr, uint16_t cqid, uint16_t vector, uint16_t size, uint16_t qflags, int ien) "create completion queue, addr=0x%"PRIx64", cqid=%"PRIu16", vector=%"PRIu16", qsize=%"PRIu16", qflags=%"PRIu16", ien=%d"
 nvme_del_sq(uint16_t qid) "deleting submission queue sqid=%"PRIu16""
-nvme_del_cq(uint16_t cqid) "deleted completion queue, sqid=%"PRIu16""
+nvme_del_cq(uint16_t cqid) "deleted completion queue, cqid=%"PRIu16""
 nvme_identify_ctrl(void) "identify controller"
 nvme_identify_ns(uint16_t ns) "identify namespace, nsid=%"PRIu16""
 nvme_identify_nslist(uint16_t ns) "identify namespace list, nsid=%"PRIu16""