diff --git a/src/blockstore/blockstore_flush.cpp b/src/blockstore/blockstore_flush.cpp
index 3ede5c5c..a83699ef 100644
--- a/src/blockstore/blockstore_flush.cpp
+++ b/src/blockstore/blockstore_flush.cpp
@@ -223,7 +223,7 @@ resume_1:
         bs->heap->unlock_entry(cur_oid, copy_id);
         goto resume_0;
     }
-    assert(!end_wr->next() && end_wr->flags == (BS_HEAP_BIG_WRITE|BS_HEAP_STABLE));
+    assert(!end_wr->next() && end_wr->entry_type == (BS_HEAP_BIG_WRITE|BS_HEAP_STABLE));
     clean_loc = end_wr->location;
     if (bs->log_level > 10)
         printf("Compacting %jx:%jx l%ju .. l%ju (last l%ju)\n", cur_oid.inode, cur_oid.stripe, end_wr->lsn, begin_wr->lsn, compact_lsn);
diff --git a/src/blockstore/blockstore_heap.cpp b/src/blockstore/blockstore_heap.cpp
index 3d7ff447..d19b950f 100644
--- a/src/blockstore/blockstore_heap.cpp
+++ b/src/blockstore/blockstore_heap.cpp
@@ -68,14 +68,14 @@ bool heap_write_t::needs_recheck(blockstore_heap_t *heap)
 
 bool heap_write_t::needs_compact(blockstore_heap_t *heap)
 {
-    return (flags == (BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE) ||
-        flags == (BS_HEAP_INTENT_WRITE|BS_HEAP_STABLE) && heap->dsk->csum_block_size > heap->dsk->bitmap_granularity &&
+    return (entry_type == (BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE) ||
+        entry_type == (BS_HEAP_INTENT_WRITE|BS_HEAP_STABLE) && heap->dsk->csum_block_size > heap->dsk->bitmap_granularity &&
         ((offset % heap->dsk->csum_block_size) || (len % heap->dsk->csum_block_size)));
 }
 
 bool heap_write_t::is_compacted(uint64_t compacted_lsn)
 {
-    return lsn <= compacted_lsn && (flags == (BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE) || flags == (BS_HEAP_INTENT_WRITE|BS_HEAP_STABLE));
+    return lsn <= compacted_lsn && (entry_type == (BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE) || entry_type == (BS_HEAP_INTENT_WRITE|BS_HEAP_STABLE));
 }
 
 bool heap_write_t::can_be_collapsed(blockstore_heap_t *heap)
@@ -87,8 +87,8 @@ bool heap_write_t::can_be_collapsed(blockstore_heap_t *heap)
 bool heap_write_t::is_allowed_before_compacted(uint64_t compacted_lsn, bool is_last_entry)
 {
     return lsn <= compacted_lsn && (is_last_entry
-        ? (flags == (BS_HEAP_BIG_WRITE|BS_HEAP_STABLE))
-        : (flags == (BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE) || flags == (BS_HEAP_INTENT_WRITE|BS_HEAP_STABLE)));
+        ? (entry_type == (BS_HEAP_BIG_WRITE|BS_HEAP_STABLE))
+        : (entry_type == (BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE) || entry_type == (BS_HEAP_INTENT_WRITE|BS_HEAP_STABLE)));
 }
 
 uint8_t *heap_write_t::get_ext_bitmap(blockstore_heap_t *heap)
@@ -738,7 +738,7 @@ bool blockstore_heap_t::recheck_small_writes(std::function<void(bool is_data, ui
                 if (is_intent)
                 {
                     auto next_wr = wr->next();
-                    assert(next_wr && next_wr->flags == (BS_HEAP_BIG_WRITE | (wr->flags & BS_HEAP_STABLE)));
+                    assert(next_wr && next_wr->entry_type == (BS_HEAP_BIG_WRITE | (wr->entry_type & BS_HEAP_STABLE)));
                     loc = wr->offset + next_wr->location;
                 }
                 recheck_in_progress++;
@@ -1247,8 +1247,8 @@ uint32_t blockstore_heap_t::block_has_compactable(uint8_t *data)
             region_marker > sizeof(heap_object_t))
         {
             heap_write_t *wr = (heap_write_t*)data;
-            if (wr->flags == (BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE) ||
-                wr->flags == (BS_HEAP_INTENT_WRITE|BS_HEAP_STABLE))
+            if (wr->entry_type == (BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE) ||
+                wr->entry_type == (BS_HEAP_INTENT_WRITE|BS_HEAP_STABLE))
             {
                 // May be freed in the future
                 sum += wr->size;
@@ -1447,7 +1447,7 @@ bool blockstore_heap_t::mvcc_save_copy(heap_object_t *obj)
         if (wr->type() == BS_HEAP_BIG_WRITE)
         {
             mvcc_data_refs[wr->location] += add_ref;
-            if (wr->flags & BS_HEAP_STABLE)
+            if (wr->entry_type & BS_HEAP_STABLE)
             {
                 if (!for_obj)
                 {
@@ -1491,19 +1491,19 @@ int blockstore_heap_t::update_object(uint32_t block_num, heap_object_t *obj, hea
 {
     const auto oid = (object_id){ .inode = obj->inode, .stripe = obj->stripe };
     // First some validation
-    bool is_overwrite = (wr->flags == (BS_HEAP_BIG_WRITE|BS_HEAP_STABLE) || wr->flags == (BS_HEAP_TOMBSTONE|BS_HEAP_STABLE));
+    bool is_overwrite = (wr->entry_type == (BS_HEAP_BIG_WRITE|BS_HEAP_STABLE) || wr->entry_type == (BS_HEAP_TOMBSTONE|BS_HEAP_STABLE));
     auto first_wr = obj->get_writes();
     if (first_wr->type() == BS_HEAP_TOMBSTONE && !is_overwrite)
     {
         // Small overwrites are only allowed over live objects
         return EINVAL;
     }
-    if (!(first_wr->flags & BS_HEAP_STABLE) && (wr->flags & BS_HEAP_STABLE))
+    if (!(first_wr->entry_type & BS_HEAP_STABLE) && (wr->entry_type & BS_HEAP_STABLE))
     {
         // Stable overwrites are not allowed over unstable
         return EINVAL;
     }
-    if (wr->flags == BS_HEAP_INTENT_WRITE && (first_wr->flags & BS_HEAP_STABLE))
+    if (wr->entry_type == BS_HEAP_INTENT_WRITE && (first_wr->entry_type & BS_HEAP_STABLE))
     {
         // Unstable intent writes over stable are not allowed
         return EINVAL;
@@ -1673,7 +1673,7 @@ int blockstore_heap_t::post_stabilize(object_id oid, uint64_t version, uint32_t
     uint64_t stab_count = 0;
     for (; wr; wr = wr->next())
     {
-        if ((wr->flags & BS_HEAP_STABLE))
+        if ((wr->entry_type & BS_HEAP_STABLE))
         {
             break;
         }
@@ -1721,9 +1721,9 @@ int blockstore_heap_t::post_stabilize(object_id oid, uint64_t version, uint32_t
     uint64_t last_lsn = next_lsn;
     for (wr = obj->get_writes(); wr; wr = wr->next())
     {
-        if (!(wr->flags & BS_HEAP_STABLE) && wr->version <= version)
+        if (!(wr->entry_type & BS_HEAP_STABLE) && wr->version <= version)
         {
-            wr->flags |= BS_HEAP_STABLE;
+            wr->entry_type |= BS_HEAP_STABLE;
             wr->lsn = last_lsn--;
             push_inflight_lsn(oid, wr->lsn, wr->needs_compact(this) ? HEAP_INFLIGHT_COMPACTABLE : 0);
         }
@@ -1750,14 +1750,14 @@ int blockstore_heap_t::post_rollback(object_id oid, uint64_t version, uint64_t *
         // No such version
         return ENOENT;
     }
-    if (wr->version == version && (wr->flags & BS_HEAP_STABLE))
+    if (wr->version == version && (wr->entry_type & BS_HEAP_STABLE))
     {
         // Already rolled back
         return 0;
     }
     for (; wr && wr->version > version; wr = wr->next())
     {
-        if (wr->flags & BS_HEAP_STABLE)
+        if (wr->entry_type & BS_HEAP_STABLE)
         {
             // Already committed, can't rollback
             return EBUSY;
@@ -1939,7 +1939,7 @@ void blockstore_heap_t::free_object_space(inode_t inode, heap_write_t *from, hea
         if (wr->type() == BS_HEAP_BIG_WRITE)
         {
             deref_data(inode, wr->location, mode != BS_HEAP_FREE_MAIN);
-            if (mode == BS_HEAP_FREE_MVCC && (wr->flags & BS_HEAP_STABLE))
+            if (mode == BS_HEAP_FREE_MVCC && (wr->entry_type & BS_HEAP_STABLE))
             {
                 // Stop at the last visible version
                 break;
@@ -2045,7 +2045,7 @@ int blockstore_heap_t::list_objects(uint32_t pg_num, object_id min_oid, object_i
             auto first_wr = obj->get_writes();
             for (auto wr = first_wr; wr; wr = wr->next())
             {
-                if (wr->flags & BS_HEAP_STABLE)
+                if (wr->entry_type & BS_HEAP_STABLE)
                 {
                     stable_version = wr->version;
                     break;
diff --git a/src/blockstore/blockstore_heap.h b/src/blockstore/blockstore_heap.h
index f123484f..d2ab7745 100644
--- a/src/blockstore/blockstore_heap.h
+++ b/src/blockstore/blockstore_heap.h
@@ -35,19 +35,19 @@ struct __attribute__((__packed__)) heap_write_t
     // size should have top bit cleared
     uint16_t size = 0;
     int16_t next_pos = 0;
+    uint8_t entry_type = 0; // BS_HEAP_*
     uint64_t lsn = 0;
     uint64_t version = 0;
     uint32_t offset = 0;
     uint32_t len = 0;
     uint64_t location = 0;
-    uint8_t flags = 0; // 1|2|3 = small|big|tombstone, 4|0 = stable|unstable
 
     // uint8_t[] external_bitmap
     // uint8_t[] internal_bitmap
     // uint32_t[] checksums
 
     heap_write_t *next();
-    inline uint8_t type() const { return (flags & BS_HEAP_TYPE); }
+    inline uint8_t type() const { return (entry_type & BS_HEAP_TYPE); }
     uint32_t get_size(blockstore_heap_t *heap);
     uint32_t get_csum_size(blockstore_heap_t *heap);
     bool needs_recheck(blockstore_heap_t *heap);
diff --git a/src/blockstore/blockstore_write.cpp b/src/blockstore/blockstore_write.cpp
index 23e504f6..a50cd96e 100644
--- a/src/blockstore/blockstore_write.cpp
+++ b/src/blockstore/blockstore_write.cpp
@@ -136,14 +136,14 @@ int blockstore_impl_t::dequeue_write(blockstore_op_t *op)
         (!perfect_csum_update || dsk.csum_block_size <= dsk.bitmap_granularity ||
             !(op->offset % dsk.csum_block_size) &&
             !(op->len % dsk.csum_block_size) &&
-            (obj->get_writes()->flags != (BS_HEAP_INTENT_WRITE|BS_HEAP_STABLE) ||
+            (obj->get_writes()->entry_type != (BS_HEAP_INTENT_WRITE|BS_HEAP_STABLE) ||
             obj->get_writes()->can_be_collapsed(heap))) &&
         // One intent-write is allowed even with fsyncs because BIG_WRITE is always counted as fsynced
         dsk.disable_meta_fsync &&
         (op->opcode == BS_OP_WRITE_STABLE &&
-            (obj->get_writes()->flags == (BS_HEAP_BIG_WRITE|BS_HEAP_STABLE) ||
-            obj->get_writes()->flags == (BS_HEAP_INTENT_WRITE|BS_HEAP_STABLE) && dsk.disable_data_fsync) ||
-        op->opcode == BS_OP_WRITE && obj->get_writes()->flags == BS_HEAP_BIG_WRITE))
+            (obj->get_writes()->entry_type == (BS_HEAP_BIG_WRITE|BS_HEAP_STABLE) ||
+            obj->get_writes()->entry_type == (BS_HEAP_INTENT_WRITE|BS_HEAP_STABLE) && dsk.disable_data_fsync) ||
+        op->opcode == BS_OP_WRITE && obj->get_writes()->entry_type == BS_HEAP_BIG_WRITE))
     {
         // Direct intent-write
         BS_SUBMIT_CHECK_SQES(1);
@@ -163,7 +163,7 @@ process_intent:
         wr->offset = op->offset;
         wr->len = op->len;
         wr->location = 0;
-        wr->flags = BS_HEAP_INTENT_WRITE | (op->opcode == BS_OP_WRITE_STABLE ? BS_HEAP_STABLE : 0);
+        wr->entry_type = BS_HEAP_INTENT_WRITE | (op->opcode == BS_OP_WRITE_STABLE ? BS_HEAP_STABLE : 0);
         if (op->bitmap)
             memcpy(wr->get_ext_bitmap(heap), op->bitmap, dsk.clean_entry_bitmap_size);
         heap->calc_checksums(wr, (uint8_t*)op->buf, true);
@@ -212,7 +212,7 @@ process_intent:
         wr->len = op->len;
         wr->location = loc;
         PRIV(op)->location = loc;
-        wr->flags = BS_HEAP_SMALL_WRITE | (op->opcode == BS_OP_WRITE_STABLE ? BS_HEAP_STABLE : 0);
+        wr->entry_type = BS_HEAP_SMALL_WRITE | (op->opcode == BS_OP_WRITE_STABLE ? BS_HEAP_STABLE : 0);
         if (op->bitmap)
             memcpy(wr->get_ext_bitmap(heap), op->bitmap, dsk.clean_entry_bitmap_size);
         heap->calc_checksums(wr, (uint8_t*)op->buf, true);
@@ -271,7 +271,7 @@ int blockstore_impl_t::make_big_write(blockstore_op_t *op, uint32_t offset, uint
     wr->offset = offset;
     wr->len = len;
     wr->location = PRIV(op)->location;
-    wr->flags = BS_HEAP_BIG_WRITE | (op->opcode == BS_OP_WRITE_STABLE ? BS_HEAP_STABLE : 0);
+    wr->entry_type = BS_HEAP_BIG_WRITE | (op->opcode == BS_OP_WRITE_STABLE ? BS_HEAP_STABLE : 0);
     if (op->bitmap)
         memcpy(wr->get_ext_bitmap(heap), op->bitmap, dsk.clean_entry_bitmap_size);
     memset(wr->get_int_bitmap(heap), 0, dsk.clean_entry_bitmap_size);
diff --git a/src/disk_tool/disk_tool_discard.cpp b/src/disk_tool/disk_tool_discard.cpp
index a38abf0a..82ca7dd6 100644
--- a/src/disk_tool/disk_tool_discard.cpp
+++ b/src/disk_tool/disk_tool_discard.cpp
@@ -59,7 +59,7 @@ int disk_tool_t::trim_data(std::string device)
         {
             for (auto wr = obj->get_writes(); wr; wr = wr->next())
             {
-                if ((wr->flags & BS_HEAP_TYPE) == BS_HEAP_BIG_WRITE)
+                if ((wr->entry_type & BS_HEAP_TYPE) == BS_HEAP_BIG_WRITE)
                 {
                     data_alloc->set(wr->location / dsk.data_block_size, true);
                 }
diff --git a/src/disk_tool/disk_tool_meta.cpp b/src/disk_tool/disk_tool_meta.cpp
index 580aa16a..4b9ceab4 100644
--- a/src/disk_tool/disk_tool_meta.cpp
+++ b/src/disk_tool/disk_tool_meta.cpp
@@ -337,11 +337,11 @@ void disk_tool_t::dump_meta_header(blockstore_meta_header_v3_t *hdr)
 void disk_tool_t::dump_heap_entry_as_old(blockstore_heap_t *heap, heap_object_t *obj)
 {
     heap_write_t *wr = NULL;
-    for (wr = obj->get_writes(); wr && wr->flags != (BS_HEAP_BIG_WRITE|BS_HEAP_STABLE) &&
-        wr->flags != (BS_HEAP_TOMBSTONE|BS_HEAP_STABLE); wr = wr->next())
+    for (wr = obj->get_writes(); wr && wr->entry_type != (BS_HEAP_BIG_WRITE|BS_HEAP_STABLE) &&
+        wr->entry_type != (BS_HEAP_TOMBSTONE|BS_HEAP_STABLE); wr = wr->next())
     {
     }
-    if (!wr || wr->flags != (BS_HEAP_BIG_WRITE|BS_HEAP_STABLE))
+    if (!wr || wr->entry_type != (BS_HEAP_BIG_WRITE|BS_HEAP_STABLE))
     {
         return;
     }
@@ -398,19 +398,19 @@ void disk_tool_t::dump_heap_entry(blockstore_heap_t *heap, heap_object_t *obj)
 #define ENTRY_FMT "{\"lsn\":%ju,\"version\":%ju,\"type\":\"%s\",\"stable\":%s,\"offset\":%u,\"len\":%u"
             (first_wr ? ENTRY_FMT : ("," ENTRY_FMT)),
 #undef ENTRY_FMT
-            wr->lsn, wr->version, (wr->flags & BS_HEAP_TYPE) == BS_HEAP_SMALL_WRITE ? "small" : (
-                (wr->flags & BS_HEAP_TYPE) == BS_HEAP_BIG_WRITE ? "big" : (
-                (wr->flags & BS_HEAP_TYPE) == BS_HEAP_INTENT_WRITE ? "intent" : (
-                (wr->flags & BS_HEAP_TYPE) == BS_HEAP_TOMBSTONE ? "tombstone" : "unknown"))),
-            (wr->flags & BS_HEAP_STABLE) ? "true" : "false",
+            wr->lsn, wr->version, (wr->entry_type & BS_HEAP_TYPE) == BS_HEAP_SMALL_WRITE ? "small" : (
+                (wr->entry_type & BS_HEAP_TYPE) == BS_HEAP_BIG_WRITE ? "big" : (
+                (wr->entry_type & BS_HEAP_TYPE) == BS_HEAP_INTENT_WRITE ? "intent" : (
+                (wr->entry_type & BS_HEAP_TYPE) == BS_HEAP_TOMBSTONE ? "tombstone" : "unknown"))),
+            (wr->entry_type & BS_HEAP_STABLE) ? "true" : "false",
             wr->offset, wr->len
         );
-        if ((wr->flags & BS_HEAP_TYPE) == BS_HEAP_BIG_WRITE ||
-            (wr->flags & BS_HEAP_TYPE) == BS_HEAP_SMALL_WRITE && !dump_with_data)
+        if ((wr->entry_type & BS_HEAP_TYPE) == BS_HEAP_BIG_WRITE ||
+            (wr->entry_type & BS_HEAP_TYPE) == BS_HEAP_SMALL_WRITE && !dump_with_data)
         {
             printf(",\"location\":%ju", wr->location);
         }
-        else if ((wr->flags & BS_HEAP_TYPE) == BS_HEAP_SMALL_WRITE && dump_with_data)
+        else if ((wr->entry_type & BS_HEAP_TYPE) == BS_HEAP_SMALL_WRITE && dump_with_data)
         {
             printf(",\"data\":\"");
             for (uint32_t i = 0; i < wr->len; i++)
@@ -612,6 +612,7 @@ int disk_tool_t::write_json_heap(json11::Json meta, json11::Json journal)
             heap_object_t *obj = (heap_object_t*)object_buf.data();
             obj->size = sizeof(heap_object_t);
             obj->write_pos = meta_entry["writes"].array_items().size() ? sizeof(heap_object_t) : 0;
+            obj->entry_type = BS_HEAP_OBJECT;
             obj->inode = oid.inode;
             obj->stripe = oid.stripe;
             size_t pos = sizeof(heap_object_t);
@@ -636,7 +637,7 @@ int disk_tool_t::write_json_heap(json11::Json meta, json11::Json journal)
                     invalid = true;
                     break;
                 }
-                wr->flags = wr_type | (write_entry["stable"].bool_value() ? BS_HEAP_STABLE : 0);
+                wr->entry_type = wr_type | (write_entry["stable"].bool_value() ? BS_HEAP_STABLE : 0);
                 wr->lsn = write_entry["lsn"].uint64_value();
                 wr->version = write_entry["version"].uint64_value();
                 wr->offset = write_entry["offset"].uint64_value();
@@ -769,11 +770,12 @@ close_err:
             heap_object_t *obj = (heap_object_t*)(new_meta_buf + meta_offset + used_space);
             obj->size = sizeof(heap_object_t);
             obj->write_pos = sizeof(heap_object_t);
+            obj->entry_type = BS_HEAP_OBJECT;
             obj->inode = oid.inode;
             obj->stripe = oid.stripe;
             heap_write_t *wr = obj->get_writes();
             wr->next_pos = 0;
-            wr->flags = BS_HEAP_BIG_WRITE|BS_HEAP_STABLE;
+            wr->entry_type = BS_HEAP_BIG_WRITE|BS_HEAP_STABLE;
             wr->lsn = ++next_lsn;
             wr->version = sscanf_json(NULL, meta_entry["version"]);
             wr->offset = 0;
@@ -802,7 +804,7 @@ close_err:
                             fprintf(stderr, "Error: entry data is missing, please generate the dump with --json --format data\n");
                             goto close_err;
                         }
-                        wr->flags = BS_HEAP_SMALL_WRITE | (rec["type"] == "small_write_instant" ? BS_HEAP_STABLE : 0);
+                        wr->entry_type = BS_HEAP_SMALL_WRITE | (rec["type"] == "small_write_instant" ? BS_HEAP_STABLE : 0);
                         fromhexstr(rec["bitmap"].string_value(), new_clean_entry_bitmap_size, wr->get_ext_bitmap(&heap));
                         fromhexstr(rec["data"].string_value(), wr->len, new_journal_buf+buffer_pos);
                         if (wr->len > 0)
@@ -816,7 +818,7 @@ close_err:
                     }
                     else if (rec["type"] == "big_write" || rec["type"] == "big_write_instant")
                     {
-                        wr->flags = BS_HEAP_BIG_WRITE | (rec["type"] == "big_write_instant" ? BS_HEAP_STABLE : 0);
+                        wr->entry_type = BS_HEAP_BIG_WRITE | (rec["type"] == "big_write_instant" ? BS_HEAP_STABLE : 0);
                         wr->location = sscanf_json(NULL, rec["loc"]);
                         bitmap_set(wr->get_int_bitmap(&heap), wr->offset, wr->len, new_meta_hdr->bitmap_granularity);
                         fromhexstr(rec["bitmap"].string_value(), new_clean_entry_bitmap_size, wr->get_ext_bitmap(&heap));
diff --git a/src/disk_tool/disk_tool_resize.cpp b/src/disk_tool/disk_tool_resize.cpp
index a6e72f4d..e1d6fc35 100644
--- a/src/disk_tool/disk_tool_resize.cpp
+++ b/src/disk_tool/disk_tool_resize.cpp
@@ -41,7 +41,7 @@ int disk_tool_t::raw_resize()
         {
             for (auto wr = obj->get_writes(); wr; wr = wr->next())
             {
-                if ((wr->flags & BS_HEAP_TYPE) == BS_HEAP_BIG_WRITE)
+                if ((wr->entry_type & BS_HEAP_TYPE) == BS_HEAP_BIG_WRITE)
                 {
                     data_alloc->set(wr->location / dsk.data_block_size, true);
                 }
@@ -567,7 +567,7 @@ int disk_tool_t::resize_rebuild_meta()
         {
             for (auto wr = obj->get_writes(); wr; wr = wr->next())
             {
-                if ((wr->flags & BS_HEAP_TYPE) == BS_HEAP_BIG_WRITE)
+                if ((wr->entry_type & BS_HEAP_TYPE) == BS_HEAP_BIG_WRITE)
                 {
                     if (wr->next() && new_meta_hdr->data_csum_type != 0 &&
                         ((wr->offset % new_meta_hdr->csum_block_size) || (wr->len % new_meta_hdr->csum_block_size)))
@@ -587,7 +587,7 @@ int disk_tool_t::resize_rebuild_meta()
                     block_num += data_idx_diff;
                     wr->location = block_num * dsk.data_block_size;
                 }
-                else if ((wr->flags & BS_HEAP_TYPE) == BS_HEAP_SMALL_WRITE)
+                else if ((wr->entry_type & BS_HEAP_TYPE) == BS_HEAP_SMALL_WRITE)
                 {
                     if (new_heap && wr->len > 0)
                     {
@@ -604,8 +604,8 @@ int disk_tool_t::resize_rebuild_meta()
                 else if (!new_heap)
                 {
                     fprintf(stderr, "Object %jx:%jx can't be converted to the old format because it contains %s\n",
-                        obj->inode, obj->stripe, (wr->flags & BS_HEAP_TYPE) == BS_HEAP_TOMBSTONE
-                            ? "a tombstone" : ((wr->flags & BS_HEAP_TYPE) == BS_HEAP_INTENT_WRITE ? "an intent_write entry" : "an unknown entry"));
+                        obj->inode, obj->stripe, (wr->entry_type & BS_HEAP_TYPE) == BS_HEAP_TOMBSTONE
+                            ? "a tombstone" : ((wr->entry_type & BS_HEAP_TYPE) == BS_HEAP_INTENT_WRITE ? "an intent_write entry" : "an unknown entry"));
                     exit(1);
                 }
             }
@@ -625,20 +625,20 @@ int disk_tool_t::resize_rebuild_meta()
                 for (ssize_t i = writes.size()-2; i >= 0; i--)
                 {
                     auto wr = writes[i];
-                    assert((wr->flags & BS_HEAP_TYPE) == BS_HEAP_SMALL_WRITE || wr->flags == BS_HEAP_BIG_WRITE);
+                    assert((wr->entry_type & BS_HEAP_TYPE) == BS_HEAP_SMALL_WRITE || wr->entry_type == BS_HEAP_BIG_WRITE);
                     uint32_t je_size = dsk.dirty_dyn_size(wr->offset, wr->len) +
-                        ((wr->flags & BS_HEAP_TYPE) == BS_HEAP_SMALL_WRITE ? sizeof(journal_entry_small_write) : sizeof(journal_entry_big_write));
+                        ((wr->entry_type & BS_HEAP_TYPE) == BS_HEAP_SMALL_WRITE ? sizeof(journal_entry_small_write) : sizeof(journal_entry_big_write));
                     choose_journal_block(je_size);
                     journal_entry *je = (journal_entry*)(new_journal_ptr + new_journal_in_pos);
                     je->magic = JOURNAL_MAGIC;
-                    je->type = (wr->flags & BS_HEAP_STABLE) ? JE_SMALL_WRITE_INSTANT : JE_SMALL_WRITE;
+                    je->type = (wr->entry_type & BS_HEAP_STABLE) ? JE_SMALL_WRITE_INSTANT : JE_SMALL_WRITE;
                     je->size = je_size;
                     je->crc32_prev = new_crc32_prev;
                     je->small_write.oid = (object_id){ .inode = obj->inode, .stripe = obj->stripe };
                     je->small_write.version = wr->version;
                     je->small_write.offset = wr->offset;
                     je->small_write.len = wr->len;
-                    if ((wr->flags & BS_HEAP_TYPE) == BS_HEAP_SMALL_WRITE)
+                    if ((wr->entry_type & BS_HEAP_TYPE) == BS_HEAP_SMALL_WRITE)
                     {
                         je->small_write.data_offset = new_journal_data-new_journal_buf;
                         if (je->small_write.data_offset + je->small_write.len > new_journal_len)
@@ -663,7 +663,7 @@ int disk_tool_t::resize_rebuild_meta()
                     new_crc32_prev = je->crc32;
                 }
                 // New -> Old
-                if (writes[writes.size()-1]->flags == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE)
+                if (writes[writes.size()-1]->entry_type == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE)
                 {
                     auto big_wr = writes[writes.size()-1];
                     uint64_t block_num = big_wr->location / dsk.data_block_size;
@@ -696,7 +696,7 @@ int disk_tool_t::resize_rebuild_meta()
                 // Old -> New
                 uint8_t wr_buf[new_heap->get_max_write_entry_size()];
                 heap_write_t *wr = (heap_write_t*)wr_buf;
-                wr->flags = BS_HEAP_BIG_WRITE|BS_HEAP_STABLE;
+                wr->entry_type = BS_HEAP_BIG_WRITE|BS_HEAP_STABLE;
                 wr->location = block_num * dsk.data_block_size;
                 wr->next_pos = 0;
                 wr->offset = 0;
diff --git a/src/test/test_heap.cpp b/src/test/test_heap.cpp
index 4852334b..39e7b7b4 100644
--- a/src/test/test_heap.cpp
+++ b/src/test/test_heap.cpp
@@ -70,7 +70,7 @@ int _test_do_big_write(blockstore_heap_t & heap, blockstore_disk_t & dsk, uint64
     wr->offset = offset;
     wr->len = len;
     wr->location = location;
-    wr->flags = BS_HEAP_BIG_WRITE | (stable ? BS_HEAP_STABLE : 0);
+    wr->entry_type = BS_HEAP_BIG_WRITE | (stable ? BS_HEAP_STABLE : 0);
     assert(heap.get_max_write_entry_size() >= wr->get_size(&heap));
     assert(wr->get_size(&heap) == sizeof(heap_write_t) + 2*dsk.clean_entry_bitmap_size + (dsk.csum_block_size
         ? dsk.data_block_size/dsk.csum_block_size*4 : 0));
@@ -108,7 +108,7 @@ int _test_do_small_write(blockstore_heap_t & heap, blockstore_disk_t & dsk, uint
     wr->offset = offset;
     wr->len = len;
     wr->location = location;
-    wr->flags = (is_intent ? BS_HEAP_INTENT_WRITE : BS_HEAP_SMALL_WRITE) | (stable ? BS_HEAP_STABLE : 0);
+    wr->entry_type = (is_intent ? BS_HEAP_INTENT_WRITE : BS_HEAP_SMALL_WRITE) | (stable ? BS_HEAP_STABLE : 0);
     assert(wr->get_size(&heap) == sizeof(heap_write_t) + dsk.clean_entry_bitmap_size + (dsk.csum_block_size
         ? ((offset+len+dsk.csum_block_size-1)/dsk.csum_block_size - offset/dsk.csum_block_size)*4 : 4));
     memset(wr->get_ext_bitmap(&heap), 0xff, dsk.clean_entry_bitmap_size);
@@ -192,7 +192,7 @@ void test_mvcc(bool csum)
         assert(wr->offset == 0);
         assert(wr->len == dsk.data_block_size);
         assert(wr->location == 0);
-        assert(wr->flags == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
+        assert(wr->entry_type == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
         uint64_t old_size = obj->size + wr->size;
 
         assert(heap.read_locked_entry(oid, copy_id) == obj);
@@ -213,7 +213,7 @@ void test_mvcc(bool csum)
         wr = obj->get_writes();
         assert(wr->lsn == 3);
         assert(wr->version == 3);
-        assert(wr->flags == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
+        assert(wr->entry_type == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
 
         assert(heap.read_locked_entry(oid, copy_id) != obj); // big_write is MVCCed
         obj = heap.read_locked_entry(oid, copy_id);
@@ -346,7 +346,7 @@ void test_compact(bool csum, bool stable)
     heap_object_t *obj = heap.lock_and_read_entry(oid, copy_id);
     assert(obj);
     assert(count_writes(obj) == 1);
-    assert(obj->get_writes()->flags == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
+    assert(obj->get_writes()->entry_type == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
     uint8_t ref_int_bitmap[dsk.clean_entry_bitmap_size];
     memset(ref_int_bitmap, 0, dsk.clean_entry_bitmap_size);
     bitmap_set(ref_int_bitmap, 0, 4096, 4096);
@@ -565,7 +565,7 @@ void test_recheck(bool async, bool csum, bool intent)
         assert(wr->offset == 0);
         assert(wr->len == dsk.data_block_size);
         assert(wr->location == 0x20000);
-        assert(wr->flags == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
+        assert(wr->entry_type == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
 
         // read object 2 - both writes should be present
         oid = { .inode = INODE_WITH_POOL(1, 2), .stripe = 0 };
@@ -578,7 +578,7 @@ void test_recheck(bool async, bool csum, bool intent)
         assert(wr->offset == 8192);
         assert(wr->len == 12*1024);
         assert(wr->location == 24*1024);
-        assert(wr->flags == BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE);
+        assert(wr->entry_type == BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE);
     }
 
     printf("OK test_recheck %s %s %s\n", async ? "async" : "sync", csum ? "csum" : "no_csum", intent ? "intent" : "buffered");
@@ -618,14 +618,14 @@ void test_corruption()
         wr->offset = 0;
         wr->len = 0;
         wr->location = 0;
-        wr->flags = BS_HEAP_TOMBSTONE|BS_HEAP_STABLE;
+        wr->entry_type = BS_HEAP_TOMBSTONE|BS_HEAP_STABLE;
         assert(!wr->get_checksums(&heap));
         res = heap.post_write(oid, wr, NULL, NULL);
         assert(res == 0);
 
         // try to do a small_write over a tombstone to fail
         wr->version = 3;
-        wr->flags = BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE;
+        wr->entry_type = BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE;
         res = heap.post_write(oid, wr, NULL, NULL);
         assert(res == EINVAL);
 
@@ -657,7 +657,7 @@ void test_corruption()
         assert(count_writes(obj) == 1);
         heap_write_t *wr = obj->get_writes();
         assert(wr->location == 0x40000);
-        assert(wr->flags == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
+        assert(wr->entry_type == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
 
         // object 3 should be present
         oid = { .inode = INODE_WITH_POOL(1, 1), .stripe = 0x40000 };
@@ -666,7 +666,7 @@ void test_corruption()
         assert(count_writes(obj) == 1);
         wr = obj->get_writes();
         assert(wr->location == 0x60000);
-        assert(wr->flags == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
+        assert(wr->entry_type == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
 
         // object 4 should be a tombstone
         oid = { .inode = INODE_WITH_POOL(1, 1), .stripe = 0x60000 };
@@ -674,7 +674,7 @@ void test_corruption()
         assert(obj);
         assert(count_writes(obj) == 1);
         wr = obj->get_writes();
-        assert(wr->flags == BS_HEAP_TOMBSTONE|BS_HEAP_STABLE);
+        assert(wr->entry_type == BS_HEAP_TOMBSTONE|BS_HEAP_STABLE);
     }
 
     printf("OK test_corruption\n");
@@ -742,11 +742,11 @@ void test_full_overwrite(bool stable)
         heap_write_t *wr = obj->get_writes();
         assert(wr->version == 4);
         assert(wr->location == 20480);
-        assert(wr->flags == BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE);
+        assert(wr->entry_type == BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE);
         wr = wr->next();
         assert(wr->version == 3);
         assert(wr->location == 0x40000);
-        assert(wr->flags == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
+        assert(wr->entry_type == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
 
         // check that the data block 0x20000 is freed and 0x40000 is used
         assert(!heap.is_data_used(0x20000));
@@ -849,7 +849,7 @@ void _test_invalid_data_setup(blockstore_disk_t & dsk, std::vector<uint8_t> & bu
     wr->next_pos = 0;
     wr->lsn = 1;
     wr->version = 1;
-    wr->flags = BS_HEAP_TOMBSTONE;
+    wr->entry_type = BS_HEAP_TOMBSTONE;
     wr->size = sizeof(heap_write_t);
     obj->crc32c = obj->calc_crc32c();
 
@@ -861,7 +861,7 @@ void _test_invalid_data_setup(blockstore_disk_t & dsk, std::vector<uint8_t> & bu
     wr = obj->get_writes();
     wr->lsn = 1;
     wr->version = 1;
-    wr->flags = BS_HEAP_TOMBSTONE;
+    wr->entry_type = BS_HEAP_TOMBSTONE;
     wr->size = sizeof(heap_write_t);
     obj->crc32c = obj->calc_crc32c();
 
@@ -872,7 +872,7 @@ void _test_invalid_data_setup(blockstore_disk_t & dsk, std::vector<uint8_t> & bu
     wr = obj->get_writes();
     wr->lsn = 2;
     wr->version = 1;
-    wr->flags = BS_HEAP_TOMBSTONE;
+    wr->entry_type = BS_HEAP_TOMBSTONE;
     wr->size = sizeof(heap_write_t);
     obj->crc32c = obj->calc_crc32c();
 }
@@ -1180,11 +1180,11 @@ void test_rollback()
         assert(wr->version == 2);
         assert(wr->location == 16384);
         assert(wr->len == 4096);
-        assert(wr->flags == BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE);
+        assert(wr->entry_type == BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE);
         wr = wr->next();
         assert(wr->version == 1);
         assert(wr->location == 0x20000);
-        assert(wr->flags == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
+        assert(wr->entry_type == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
 
         assert(heap.is_data_used(0x20000));
         assert(!heap.is_data_used(0x40000));
@@ -1404,7 +1404,7 @@ void test_duplicate()
         heap_write_t *wr = obj->get_writes();
         assert(wr->version == 2);
         assert(wr->location == 0x40000);
-        assert(wr->flags == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
+        assert(wr->entry_type == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
 
         assert(heap.get_meta_block_used_space(0) == 0);
         assert(heap.get_meta_block_used_space(1) == obj->size+wr->size);
@@ -1428,7 +1428,7 @@ void test_duplicate()
         heap_write_t *wr = obj->get_writes();
         assert(wr->version == 2);
         assert(wr->location == 0x40000);
-        assert(wr->flags == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
+        assert(wr->entry_type == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
 
         assert(heap.get_meta_block_used_space(0) == 0);
         assert(heap.get_meta_block_used_space(1) == obj->size+wr->size);
@@ -1500,21 +1500,21 @@ void test_autocompact(bool csum)
         assert(wr->offset == 7*4096);
         assert(wr->len == 4096);
         assert(wr->location == 7*4096);
-        assert(wr->flags == BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE);
+        assert(wr->entry_type == BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE);
         wr = wr->next();
         assert(wr->lsn == 4);
         assert(wr->version == 4);
         assert(wr->offset == 5*4096);
         assert(wr->len == 4096);
         assert(wr->location == 6*4096);
-        assert(wr->flags == BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE);
+        assert(wr->entry_type == BS_HEAP_SMALL_WRITE|BS_HEAP_STABLE);
         wr = wr->next();
         assert(wr->lsn == 3);
         assert(wr->version == 3);
         assert(wr->offset == 0);
         assert(wr->len == dsk.data_block_size);
         assert(wr->location == 0x20000);
-        assert(wr->flags == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
+        assert(wr->entry_type == BS_HEAP_BIG_WRITE|BS_HEAP_STABLE);
 
         // check that blocks are auto-freed
         assert(heap.is_data_used(0x20000));