Use an interface instead of explicit blockstore_t wrapper

src/blockstore/blockstore.cpp

@@ -3,98 +3,7 @@
 
 #include "blockstore_impl.h"
 
-blockstore_t::blockstore_t(blockstore_config_t & config, ring_loop_t *ringloop, timerfd_manager_t *tfd)
+blockstore_i* blockstore_i::create(blockstore_config_t & config, ring_loop_t *ringloop, timerfd_manager_t *tfd)
 {
-    impl = new blockstore_impl_t(config, ringloop, tfd);
-}
-
-blockstore_t::~blockstore_t()
-{
-    delete impl;
-}
-
-void blockstore_t::parse_config(blockstore_config_t & config)
-{
-    impl->parse_config(config, false);
-}
-
-void blockstore_t::loop()
-{
-    impl->loop();
-}
-
-bool blockstore_t::is_started()
-{
-    return impl->is_started();
-}
-
-bool blockstore_t::is_stalled()
-{
-    return impl->is_stalled();
-}
-
-bool blockstore_t::is_safe_to_stop()
-{
-    return impl->is_safe_to_stop();
-}
-
-void blockstore_t::enqueue_op(blockstore_op_t *op)
-{
-    impl->enqueue_op(op);
-}
-
-int blockstore_t::read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version)
-{
-    return impl->read_bitmap(oid, target_version, bitmap, result_version);
-}
-
-const std::map<uint64_t, uint64_t> & blockstore_t::get_inode_space_stats()
-{
-    return impl->get_inode_space_stats();
-}
-
-void blockstore_t::dump_diagnostics()
-{
-    return impl->dump_diagnostics();
-}
-
-std::string blockstore_t::get_op_diag(blockstore_op_t *op)
-{
-    char buf[256];
-    auto priv = PRIV(op);
-    if (priv->wait_for)
-        snprintf(buf, sizeof(buf), "state=%d wait=%d (detail=%ju)", priv->op_state, priv->wait_for, priv->wait_detail);
-    else
-        snprintf(buf, sizeof(buf), "state=%d", priv->op_state);
-    return std::string(buf);
-}
-
-uint32_t blockstore_t::get_block_size()
-{
-    return impl->get_block_size();
-}
-
-uint64_t blockstore_t::get_block_count()
-{
-    return impl->get_block_count();
-}
-
-uint64_t blockstore_t::get_free_block_count()
-{
-    return impl->get_free_block_count();
-}
-
-uint64_t blockstore_t::get_journal_size()
-{
-    return impl->get_journal_size();
-}
-
-uint32_t blockstore_t::get_bitmap_granularity()
-{
-    return impl->get_bitmap_granularity();
-}
-
-void blockstore_t::set_no_inode_stats(const std::vector<uint64_t> & pool_ids)
-{
-    impl->set_no_inode_stats(pool_ids);
+    return new blockstore_impl_t(config, ringloop, tfd);
 }

src/blockstore/blockstore.h

@@ -173,56 +173,54 @@ struct __attribute__ ((visibility("default"))) blockstore_op_t
 
 typedef std::map<std::string, std::string> blockstore_config_t;
 
-class blockstore_impl_t;
-
-class __attribute__((visibility("default"))) blockstore_t
+class __attribute__((visibility("default"))) blockstore_i
 {
-    blockstore_impl_t *impl;
 public:
-    blockstore_t(blockstore_config_t & config, ring_loop_t *ringloop, timerfd_manager_t *tfd);
-    ~blockstore_t();
+    static blockstore_i* create(blockstore_config_t & config, ring_loop_t *ringloop, timerfd_manager_t *tfd);
+
+    virtual ~blockstore_i() = default;
 
     // Update configuration
-    void parse_config(blockstore_config_t & config);
+    virtual void parse_config(blockstore_config_t & config) = 0;
 
     // Event loop
-    void loop();
+    virtual void loop() = 0;
 
     // Returns true when blockstore is ready to process operations
     // (Although you're free to enqueue them before that)
-    bool is_started();
+    virtual bool is_started() = 0;
 
     // Returns true when blockstore is stalled
-    bool is_stalled();
+    virtual bool is_stalled() = 0;
 
     // Returns true when it's safe to destroy the instance. If destroying the instance
     // requires to purge some queues, starts that process. Should be called in the event
     // loop until it returns true.
-    bool is_safe_to_stop();
+    virtual bool is_safe_to_stop() = 0;
 
     // Submission
-    void enqueue_op(blockstore_op_t *op);
+    virtual void enqueue_op(blockstore_op_t *op) = 0;
 
     // Simplified synchronous operation: get object bitmap & current version
-    int read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version = NULL);
+    virtual int read_bitmap(object_id oid, uint64_t target_version, void *bitmap, uint64_t *result_version = NULL) = 0;
 
     // Get per-inode space usage statistics
-    const std::map<uint64_t, uint64_t> & get_inode_space_stats();
+    virtual const std::map<uint64_t, uint64_t> & get_inode_space_stats() = 0;
 
     // Set per-pool no_inode_stats
-    void set_no_inode_stats(const std::vector<uint64_t> & pool_ids);
+    virtual void set_no_inode_stats(const std::vector<uint64_t> & pool_ids) = 0;
 
     // Print diagnostics to stdout
-    void dump_diagnostics();
+    virtual void dump_diagnostics() = 0;
 
     // Get diagnostic string for an operation
-    std::string get_op_diag(blockstore_op_t *op);
+    virtual std::string get_op_diag(blockstore_op_t *op) = 0;
 
-    uint32_t get_block_size();
-    uint64_t get_block_count();
-    uint64_t get_free_block_count();
+    virtual uint32_t get_block_size() = 0;
+    virtual uint64_t get_block_count() = 0;
+    virtual uint64_t get_free_block_count() = 0;
 
-    uint64_t get_journal_size();
+    virtual uint64_t get_journal_size() = 0;
 
-    uint32_t get_bitmap_granularity();
+    virtual uint32_t get_bitmap_granularity() = 0;
 };

src/blockstore/blockstore_impl.cpp

@@ -792,3 +792,14 @@ void blockstore_impl_t::recalc_inode_space_stats(uint64_t pool_id, bool per_inod
         dirty_it++;
     }
 }
+
+std::string blockstore_impl_t::get_op_diag(blockstore_op_t *op)
+{
+    char buf[256];
+    auto priv = PRIV(op);
+    if (priv->wait_for)
+        snprintf(buf, sizeof(buf), "state=%d wait=%d (detail=%ju)", priv->op_state, priv->wait_for, priv->wait_detail);
+    else
+        snprintf(buf, sizeof(buf), "state=%d", priv->op_state);
+    return std::string(buf);
+}

src/blockstore/blockstore_impl.h

@@ -196,7 +196,7 @@ struct pool_shard_settings_t
 #define STAB_SPLIT_SYNC 3
 #define STAB_SPLIT_TODO 4
 
-class blockstore_impl_t
+class blockstore_impl_t: public blockstore_i
 {
     blockstore_disk_t dsk;
 
@@ -361,6 +361,7 @@ public:
     blockstore_impl_t(blockstore_config_t & config, ring_loop_t *ringloop, timerfd_manager_t *tfd);
     ~blockstore_impl_t();
 
+    void parse_config(blockstore_config_t & config);
     void parse_config(blockstore_config_t & config, bool init);
 
     // Event loop
@@ -396,6 +397,9 @@ public:
     // Print diagnostics to stdout
     void dump_diagnostics();
 
+    // Get diagnostic string for an operation
+    std::string get_op_diag(blockstore_op_t *op);
+
     inline uint32_t get_block_size() { return dsk.data_block_size; }
     inline uint64_t get_block_count() { return dsk.block_count; }
     inline uint64_t get_free_block_count() { return dsk.block_count - used_blocks; }

src/blockstore/blockstore_journal.h

@@ -3,6 +3,8 @@
 
 #pragma once
 
+class blockstore_impl_t;
+
 struct journal_sector_info_t
 {
     uint64_t offset;

src/blockstore/blockstore_open.cpp

@@ -4,6 +4,11 @@
 #include <sys/file.h>
 #include "blockstore_impl.h"
 
+void blockstore_impl_t::parse_config(blockstore_config_t & config)
+{
+    return parse_config(config, false);
+}
+
 void blockstore_impl_t::parse_config(blockstore_config_t & config, bool init)
 {
     // Online-configurable options:

src/blockstore/fio_engine.cpp

@@ -32,7 +32,7 @@
 
 struct bs_data
 {
-    blockstore_t *bs;
+    blockstore_i *bs;
     epoll_manager_t *epmgr;
     ring_loop_t *ringloop;
     /* The list of completed io_u structs. */
@@ -162,7 +162,7 @@ static int bs_init(struct thread_data *td)
     }
     bsd->ringloop = new ring_loop_t(RINGLOOP_DEFAULT_SIZE);
     bsd->epmgr = new epoll_manager_t(bsd->ringloop);
-    bsd->bs = new blockstore_t(config, bsd->ringloop, bsd->epmgr->tfd);
+    bsd->bs = blockstore_i::create(config, bsd->ringloop, bsd->epmgr->tfd);
     bsd->imm = config.find("immediate_commit") == config.end() ||
         config["immediate_commit"] == "all";
     while (1)

src/osd/osd.cpp

@@ -34,7 +34,7 @@ osd_t::osd_t(const json11::Json & config, ring_loop_t *ringloop)
     if (!json_is_true(this->config["disable_blockstore"]))
     {
         auto bs_cfg = json_to_string_map(this->config);
-        this->bs = new blockstore_t(bs_cfg, ringloop, tfd);
+        this->bs = blockstore_i::create(bs_cfg, ringloop, tfd);
         // Wait for blockstore initialisation before actually starting OSD logic
         // to prevent peering timeouts during restart with filled databases
         while (!bs->is_started())

src/osd/osd.h

@@ -202,7 +202,7 @@ class osd_t
 
     bool stopping = false;
     int inflight_ops = 0;
-    blockstore_t *bs = NULL;
+    blockstore_i *bs = NULL;
     void *zero_buffer = NULL;
     uint64_t zero_buffer_size = 0;
     uint32_t bs_block_size, bs_bitmap_granularity, clean_entry_bitmap_size;

src/test/test_blockstore.cpp

@@ -13,7 +13,7 @@ int main(int narg, char *args[])
     config["data_device"] = "./test_data.bin";
     ring_loop_t *ringloop = new ring_loop_t(RINGLOOP_DEFAULT_SIZE);
     epoll_manager_t *epmgr = new epoll_manager_t(ringloop);
-    blockstore_t *bs = new blockstore_t(config, ringloop, epmgr->tfd);
+    blockstore_i *bs = blockstore_i::create(config, ringloop, epmgr->tfd);
 
     blockstore_op_t op;
     int main_state = 0;