X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=src%2Fceph%2Fsrc%2Fos%2Fmemstore%2FMemStore.h;fp=src%2Fceph%2Fsrc%2Fos%2Fmemstore%2FMemStore.h;h=e17574cc0f5f8edffb65d324758919785ef3252d;hb=812ff6ca9fcd3e629e49d4328905f33eee8ca3f5;hp=0000000000000000000000000000000000000000;hpb=15280273faafb77777eab341909a3f495cf248d9;p=stor4nfv.git

diff --git a/src/ceph/src/os/memstore/MemStore.h b/src/ceph/src/os/memstore/MemStore.h
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+++ b/src/ceph/src/os/memstore/MemStore.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2013- Sage Weil <sage@inktank.com>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+
+#ifndef CEPH_MEMSTORE_H
+#define CEPH_MEMSTORE_H
+
+#include <mutex>
+#include <boost/intrusive_ptr.hpp>
+
+#include "include/unordered_map.h"
+#include "include/memory.h"
+#include "include/Spinlock.h"
+#include "common/Finisher.h"
+#include "common/RefCountedObj.h"
+#include "common/RWLock.h"
+#include "os/ObjectStore.h"
+#include "PageSet.h"
+#include "include/assert.h"
+
+class MemStore : public ObjectStore {
+public:
+  struct Object : public RefCountedObject {
+    std::mutex xattr_mutex;
+    std::mutex omap_mutex;
+    map<string,bufferptr> xattr;
+    bufferlist omap_header;
+    map<string,bufferlist> omap;
+
+    typedef boost::intrusive_ptr<Object> Ref;
+    friend void intrusive_ptr_add_ref(Object *o) { o->get(); }
+    friend void intrusive_ptr_release(Object *o) { o->put(); }
+
+    Object() : RefCountedObject(nullptr, 0) {}
+    // interface for object data
+    virtual size_t get_size() const = 0;
+    virtual int read(uint64_t offset, uint64_t len, bufferlist &bl) = 0;
+    virtual int write(uint64_t offset, const bufferlist &bl) = 0;
+    virtual int clone(Object *src, uint64_t srcoff, uint64_t len,
+                      uint64_t dstoff) = 0;
+    virtual int truncate(uint64_t offset) = 0;
+    virtual void encode(bufferlist& bl) const = 0;
+    virtual void decode(bufferlist::iterator& p) = 0;
+
+    void encode_base(bufferlist& bl) const {
+      ::encode(xattr, bl);
+      ::encode(omap_header, bl);
+      ::encode(omap, bl);
+    }
+    void decode_base(bufferlist::iterator& p) {
+      ::decode(xattr, p);
+      ::decode(omap_header, p);
+      ::decode(omap, p);
+    }
+
+    void dump(Formatter *f) const {
+      f->dump_int("data_len", get_size());
+      f->dump_int("omap_header_len", omap_header.length());
+
+      f->open_array_section("xattrs");
+      for (map<string,bufferptr>::const_iterator p = xattr.begin();
+	   p != xattr.end();
+	   ++p) {
+	f->open_object_section("xattr");
+	f->dump_string("name", p->first);
+	f->dump_int("length", p->second.length());
+	f->close_section();
+      }
+      f->close_section();
+
+      f->open_array_section("omap");
+      for (map<string,bufferlist>::const_iterator p = omap.begin();
+	   p != omap.end();
+	   ++p) {
+	f->open_object_section("pair");
+	f->dump_string("key", p->first);
+	f->dump_int("length", p->second.length());
+	f->close_section();
+      }
+      f->close_section();
+    }
+  };
+  typedef Object::Ref ObjectRef;
+
+  struct PageSetObject;
+  struct Collection : public CollectionImpl {
+    coll_t cid;
+    int bits;
+    CephContext *cct;
+    bool use_page_set;
+    ceph::unordered_map<ghobject_t, ObjectRef> object_hash;  ///< for lookup
+    map<ghobject_t, ObjectRef> object_map;        ///< for iteration
+    map<string,bufferptr> xattr;
+    RWLock lock;   ///< for object_{map,hash}
+    bool exists;
+
+    typedef boost::intrusive_ptr<Collection> Ref;
+    friend void intrusive_ptr_add_ref(Collection *c) { c->get(); }
+    friend void intrusive_ptr_release(Collection *c) { c->put(); }
+
+    const coll_t &get_cid() override {
+      return cid;
+    }
+
+    ObjectRef create_object() const;
+
+    // NOTE: The lock only needs to protect the object_map/hash, not the
+    // contents of individual objects.  The osd is already sequencing
+    // reads and writes, so we will never see them concurrently at this
+    // level.
+
+    ObjectRef get_object(ghobject_t oid) {
+      RWLock::RLocker l(lock);
+      auto o = object_hash.find(oid);
+      if (o == object_hash.end())
+	return ObjectRef();
+      return o->second;
+    }
+
+    ObjectRef get_or_create_object(ghobject_t oid) {
+      RWLock::WLocker l(lock);
+      auto result = object_hash.emplace(oid, ObjectRef());
+      if (result.second)
+        object_map[oid] = result.first->second = create_object();
+      return result.first->second;
+    }
+
+    void encode(bufferlist& bl) const {
+      ENCODE_START(1, 1, bl);
+      ::encode(xattr, bl);
+      ::encode(use_page_set, bl);
+      uint32_t s = object_map.size();
+      ::encode(s, bl);
+      for (map<ghobject_t, ObjectRef>::const_iterator p = object_map.begin();
+	   p != object_map.end();
+	   ++p) {
+	::encode(p->first, bl);
+	p->second->encode(bl);
+      }
+      ENCODE_FINISH(bl);
+    }
+    void decode(bufferlist::iterator& p) {
+      DECODE_START(1, p);
+      ::decode(xattr, p);
+      ::decode(use_page_set, p);
+      uint32_t s;
+      ::decode(s, p);
+      while (s--) {
+	ghobject_t k;
+	::decode(k, p);
+	auto o = create_object();
+	o->decode(p);
+	object_map.insert(make_pair(k, o));
+	object_hash.insert(make_pair(k, o));
+      }
+      DECODE_FINISH(p);
+    }
+
+    uint64_t used_bytes() const {
+      uint64_t result = 0;
+      for (map<ghobject_t, ObjectRef>::const_iterator p = object_map.begin();
+	   p != object_map.end();
+	   ++p) {
+        result += p->second->get_size();
+      }
+
+      return result;
+    }
+
+    explicit Collection(CephContext *cct, coll_t c)
+      : cid(c),
+	cct(cct),
+	use_page_set(cct->_conf->memstore_page_set),
+        lock("MemStore::Collection::lock", true, false),
+	exists(true) {}
+  };
+  typedef Collection::Ref CollectionRef;
+
+private:
+  class OmapIteratorImpl;
+
+
+  ceph::unordered_map<coll_t, CollectionRef> coll_map;
+  RWLock coll_lock;    ///< rwlock to protect coll_map
+
+  CollectionRef get_collection(const coll_t& cid);
+
+  Finisher finisher;
+
+  uint64_t used_bytes;
+
+  void _do_transaction(Transaction& t);
+
+  int _touch(const coll_t& cid, const ghobject_t& oid);
+  int _write(const coll_t& cid, const ghobject_t& oid, uint64_t offset, size_t len,
+	      const bufferlist& bl, uint32_t fadvise_flags = 0);
+  int _zero(const coll_t& cid, const ghobject_t& oid, uint64_t offset, size_t len);
+  int _truncate(const coll_t& cid, const ghobject_t& oid, uint64_t size);
+  int _remove(const coll_t& cid, const ghobject_t& oid);
+  int _setattrs(const coll_t& cid, const ghobject_t& oid, map<string,bufferptr>& aset);
+  int _rmattr(const coll_t& cid, const ghobject_t& oid, const char *name);
+  int _rmattrs(const coll_t& cid, const ghobject_t& oid);
+  int _clone(const coll_t& cid, const ghobject_t& oldoid, const ghobject_t& newoid);
+  int _clone_range(const coll_t& cid, const ghobject_t& oldoid,
+		   const ghobject_t& newoid,
+		   uint64_t srcoff, uint64_t len, uint64_t dstoff);
+  int _omap_clear(const coll_t& cid, const ghobject_t &oid);
+  int _omap_setkeys(const coll_t& cid, const ghobject_t &oid, bufferlist& aset_bl);
+  int _omap_rmkeys(const coll_t& cid, const ghobject_t &oid, bufferlist& keys_bl);
+  int _omap_rmkeyrange(const coll_t& cid, const ghobject_t &oid,
+		       const string& first, const string& last);
+  int _omap_setheader(const coll_t& cid, const ghobject_t &oid, const bufferlist &bl);
+
+  int _collection_hint_expected_num_objs(const coll_t& cid, uint32_t pg_num,
+      uint64_t num_objs) const { return 0; }
+  int _create_collection(const coll_t& c, int bits);
+  int _destroy_collection(const coll_t& c);
+  int _collection_add(const coll_t& cid, const coll_t& ocid, const ghobject_t& oid);
+  int _collection_move_rename(const coll_t& oldcid, const ghobject_t& oldoid,
+			      coll_t cid, const ghobject_t& o);
+  int _split_collection(const coll_t& cid, uint32_t bits, uint32_t rem, coll_t dest);
+
+  int _save();
+  int _load();
+
+  void dump(Formatter *f);
+  void dump_all();
+
+public:
+  MemStore(CephContext *cct, const string& path)
+    : ObjectStore(cct, path),
+      coll_lock("MemStore::coll_lock"),
+      finisher(cct),
+      used_bytes(0) {}
+  ~MemStore() override { }
+
+  string get_type() override {
+    return "memstore";
+  }
+
+  bool test_mount_in_use() override {
+    return false;
+  }
+
+  int mount() override;
+  int umount() override;
+
+  int fsck(bool deep) override {
+    return 0;
+  }
+
+  int validate_hobject_key(const hobject_t &obj) const override {
+    return 0;
+  }
+  unsigned get_max_attr_name_length() override {
+    return 256;  // arbitrary; there is no real limit internally
+  }
+
+  int mkfs() override;
+  int mkjournal() override {
+    return 0;
+  }
+  bool wants_journal() override {
+    return false;
+  }
+  bool allows_journal() override {
+    return false;
+  }
+  bool needs_journal() override {
+    return false;
+  }
+
+  int statfs(struct store_statfs_t *buf) override;
+
+  bool exists(const coll_t& cid, const ghobject_t& oid) override;
+  bool exists(CollectionHandle &c, const ghobject_t& oid) override;
+  int stat(const coll_t& cid, const ghobject_t& oid,
+	   struct stat *st, bool allow_eio = false) override;
+  int stat(CollectionHandle &c, const ghobject_t& oid,
+	   struct stat *st, bool allow_eio = false) override;
+  int set_collection_opts(
+    const coll_t& cid,
+    const pool_opts_t& opts) override;
+  int read(
+    const coll_t& cid,
+    const ghobject_t& oid,
+    uint64_t offset,
+    size_t len,
+    bufferlist& bl,
+    uint32_t op_flags = 0) override;
+  int read(
+    CollectionHandle &c,
+    const ghobject_t& oid,
+    uint64_t offset,
+    size_t len,
+    bufferlist& bl,
+    uint32_t op_flags = 0) override;
+  using ObjectStore::fiemap;
+  int fiemap(const coll_t& cid, const ghobject_t& oid, uint64_t offset, size_t len, bufferlist& bl) override;
+  int fiemap(const coll_t& cid, const ghobject_t& oid, uint64_t offset, size_t len, map<uint64_t, uint64_t>& destmap) override;
+  int getattr(const coll_t& cid, const ghobject_t& oid, const char *name,
+	      bufferptr& value) override;
+  int getattr(CollectionHandle &c, const ghobject_t& oid, const char *name,
+	      bufferptr& value) override;
+  int getattrs(const coll_t& cid, const ghobject_t& oid,
+	       map<string,bufferptr>& aset) override;
+  int getattrs(CollectionHandle &c, const ghobject_t& oid,
+	       map<string,bufferptr>& aset) override;
+
+  int list_collections(vector<coll_t>& ls) override;
+
+  CollectionHandle open_collection(const coll_t& c) override {
+    return get_collection(c);
+  }
+  bool collection_exists(const coll_t& c) override;
+  int collection_empty(const coll_t& c, bool *empty) override;
+  int collection_bits(const coll_t& c) override;
+  using ObjectStore::collection_list;
+  int collection_list(const coll_t& cid,
+		      const ghobject_t& start, const ghobject_t& end, int max,
+		      vector<ghobject_t> *ls, ghobject_t *next) override;
+
+  using ObjectStore::omap_get;
+  int omap_get(
+    const coll_t& cid,                ///< [in] Collection containing oid
+    const ghobject_t &oid,   ///< [in] Object containing omap
+    bufferlist *header,      ///< [out] omap header
+    map<string, bufferlist> *out /// < [out] Key to value map
+    ) override;
+
+  using ObjectStore::omap_get_header;
+  /// Get omap header
+  int omap_get_header(
+    const coll_t& cid,                ///< [in] Collection containing oid
+    const ghobject_t &oid,   ///< [in] Object containing omap
+    bufferlist *header,      ///< [out] omap header
+    bool allow_eio = false ///< [in] don't assert on eio
+    ) override;
+
+  using ObjectStore::omap_get_keys;
+  /// Get keys defined on oid
+  int omap_get_keys(
+    const coll_t& cid,              ///< [in] Collection containing oid
+    const ghobject_t &oid, ///< [in] Object containing omap
+    set<string> *keys      ///< [out] Keys defined on oid
+    ) override;
+
+  using ObjectStore::omap_get_values;
+  /// Get key values
+  int omap_get_values(
+    const coll_t& cid,                    ///< [in] Collection containing oid
+    const ghobject_t &oid,       ///< [in] Object containing omap
+    const set<string> &keys,     ///< [in] Keys to get
+    map<string, bufferlist> *out ///< [out] Returned keys and values
+    ) override;
+
+  using ObjectStore::omap_check_keys;
+  /// Filters keys into out which are defined on oid
+  int omap_check_keys(
+    const coll_t& cid,                ///< [in] Collection containing oid
+    const ghobject_t &oid,   ///< [in] Object containing omap
+    const set<string> &keys, ///< [in] Keys to check
+    set<string> *out         ///< [out] Subset of keys defined on oid
+    ) override;
+
+  using ObjectStore::get_omap_iterator;
+  ObjectMap::ObjectMapIterator get_omap_iterator(
+    const coll_t& cid,              ///< [in] collection
+    const ghobject_t &oid  ///< [in] object
+    ) override;
+
+  void set_fsid(uuid_d u) override;
+  uuid_d get_fsid() override;
+
+  uint64_t estimate_objects_overhead(uint64_t num_objects) override {
+    return 0; //do not care
+  }
+
+  objectstore_perf_stat_t get_cur_stats() override;
+
+  const PerfCounters* get_perf_counters() const override {
+    return nullptr;
+  }
+
+
+  int queue_transactions(
+    Sequencer *osr, vector<Transaction>& tls,
+    TrackedOpRef op = TrackedOpRef(),
+    ThreadPool::TPHandle *handle = NULL) override;
+};
+
+
+
+
+#endif