initial code repo

[stor4nfv.git] / src / ceph / src / os / bluestore / KernelDevice.h

diff --git a/src/ceph/src/os/bluestore/KernelDevice.h b/src/ceph/src/os/bluestore/KernelDevice.h
new file mode 100644 (file)
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+++ b/src/ceph/src/os/bluestore/KernelDevice.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) 2014 Red Hat
+ *
+ * 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_OS_BLUESTORE_KERNELDEVICE_H
+#define CEPH_OS_BLUESTORE_KERNELDEVICE_H
+
+#include <atomic>
+
+#include "os/fs/FS.h"
+#include "include/interval_set.h"
+
+#include "aio.h"
+#include "BlockDevice.h"
+
+class KernelDevice : public BlockDevice {
+  int fd_direct, fd_buffered;
+  uint64_t size;
+  uint64_t block_size;
+  std::string path;
+  FS *fs;
+  bool aio, dio;
+
+  Mutex debug_lock;
+  interval_set<uint64_t> debug_inflight;
+
+  std::atomic<bool> io_since_flush = {false};
+  std::mutex flush_mutex;
+
+  aio_queue_t aio_queue;
+  aio_callback_t aio_callback;
+  void *aio_callback_priv;
+  bool aio_stop;
+
+  struct AioCompletionThread : public Thread {
+    KernelDevice *bdev;
+    explicit AioCompletionThread(KernelDevice *b) : bdev(b) {}
+    void *entry() override {
+      bdev->_aio_thread();
+      return NULL;
+    }
+  } aio_thread;
+
+  std::atomic_int injecting_crash;
+
+  void _aio_thread();
+  int _aio_start();
+  void _aio_stop();
+
+  void _aio_log_start(IOContext *ioc, uint64_t offset, uint64_t length);
+  void _aio_log_finish(IOContext *ioc, uint64_t offset, uint64_t length);
+
+  int _sync_write(uint64_t off, bufferlist& bl, bool buffered);
+
+  int _lock();
+
+  int direct_read_unaligned(uint64_t off, uint64_t len, char *buf);
+
+  // stalled aio debugging
+  aio_list_t debug_queue;
+  std::mutex debug_queue_lock;
+  aio_t *debug_oldest = nullptr;
+  utime_t debug_stall_since;
+  void debug_aio_link(aio_t& aio);
+  void debug_aio_unlink(aio_t& aio);
+
+public:
+  KernelDevice(CephContext* cct, aio_callback_t cb, void *cbpriv);
+
+  void aio_submit(IOContext *ioc) override;
+
+  uint64_t get_size() const override {
+    return size;
+  }
+  uint64_t get_block_size() const override {
+    return block_size;
+  }
+
+  int collect_metadata(std::string prefix, map<std::string,std::string> *pm) const override;
+
+  int read(uint64_t off, uint64_t len, bufferlist *pbl,
+          IOContext *ioc,
+          bool buffered) override;
+  int aio_read(uint64_t off, uint64_t len, bufferlist *pbl,
+              IOContext *ioc) override;
+  int read_random(uint64_t off, uint64_t len, char *buf, bool buffered) override;
+
+  int write(uint64_t off, bufferlist& bl, bool buffered) override;
+  int aio_write(uint64_t off, bufferlist& bl,
+               IOContext *ioc,
+               bool buffered) override;
+  int flush() override;
+
+  // for managing buffered readers/writers
+  int invalidate_cache(uint64_t off, uint64_t len) override;
+  int open(const std::string& path) override;
+  void close() override;
+};
+
+#endif