ceph/src/os/filestore/GenericFileStoreBackend.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  *
  13  */
  14
  15 #ifndef CEPH_GENERICFILESTOREBACKEDN_H
  16 #define CEPH_GENERICFILESTOREBACKEDN_H
  17
  18 #include "FileStore.h"
  19
  20 class SloppyCRCMap;
  21
  22 class GenericFileStoreBackend : public FileStoreBackend {
  23 private:
  24   bool ioctl_fiemap;
  25   bool seek_data_hole;
  26   bool use_splice;
  27   bool m_filestore_fiemap;
  28   bool m_filestore_seek_data_hole;
  29   bool m_filestore_fsync_flushes_journal_data;
  30   bool m_filestore_splice;
  31   bool m_rotational = true;
  32 public:
  33   explicit GenericFileStoreBackend(FileStore *fs);
  34   ~GenericFileStoreBackend() override {}
  35
  36   const char *get_name() override {
  37     return "generic";
  38   }
  39   int detect_features() override;
  40   int create_current() override;
  41   bool can_checkpoint() override { return false; }
  42   bool is_rotational() override {
  43     return m_rotational;
  44   }
  45   int list_checkpoints(list<string>& ls) override { return 0; }
  46   int create_checkpoint(const string& name, uint64_t *cid) override { return -EOPNOTSUPP; }
  47   int sync_checkpoint(uint64_t id) override { return -EOPNOTSUPP; }
  48   int rollback_to(const string& name) override { return -EOPNOTSUPP; }
  49   int destroy_checkpoint(const string& name) override { return -EOPNOTSUPP; }
  50   int syncfs() override;
  51   bool has_fiemap() override { return ioctl_fiemap; }
  52   bool has_seek_data_hole() override { return seek_data_hole; }
  53   int do_fiemap(int fd, off_t start, size_t len, struct fiemap **pfiemap) override;
  54   int clone_range(int from, int to, uint64_t srcoff, uint64_t len, uint64_t dstoff) override {
  55     return _copy_range(from, to, srcoff, len, dstoff);
  56   }
  57   int set_alloc_hint(int fd, uint64_t hint) override { return -EOPNOTSUPP; }
  58   bool has_splice() const override { return use_splice; }
  59 private:
  60   int _crc_load_or_init(int fd, SloppyCRCMap *cm);
  61   int _crc_save(int fd, SloppyCRCMap *cm);
  62 public:
  63   int _crc_update_write(int fd, loff_t off, size_t len, const bufferlist& bl) override;
  64   int _crc_update_truncate(int fd, loff_t off) override;
  65   int _crc_update_zero(int fd, loff_t off, size_t len) override;
  66   int _crc_update_clone_range(int srcfd, int destfd,
  67                                       loff_t srcoff, size_t len, loff_t dstoff) override;
  68   int _crc_verify_read(int fd, loff_t off, size_t len, const bufferlist& bl,
  69                                ostream *out) override;
  70 };
  71 #endif