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https://github.com/ceph/ceph
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6456802394
This is primarily for librbd/krbd's benefit and is supposed to combat fragmentation: "... knowing that rbd images have a 4m size, librbd can pass a hint that will let the osd do the xfs allocation size ioctl on new files so that they are allocated in 1m or 4m chunks. We've seen cases where users with rbd workloads have very high levels of fragmentation in xfs and this would mitigate that and probably have a pretty nice performance benefit." SETALLOCHINT is considered advisory, so our backwards compatibility mechanism here is to set FAILOK flag for all SETALLOCHINT ops. xfs is hooked up in the subsequent commits. Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
60 lines
2.2 KiB
C++
60 lines
2.2 KiB
C++
// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
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// vim: ts=8 sw=2 smarttab
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/*
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* Ceph - scalable distributed file system
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*
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* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
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*
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* This is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License version 2.1, as published by the Free Software
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* Foundation. See file COPYING.
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*
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*/
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#ifndef CEPH_GENERICFILESTOREBACKEDN_H
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#define CEPH_GENERICFILESTOREBACKEDN_H
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#include "FileStore.h"
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class SloppyCRCMap;
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class GenericFileStoreBackend : public FileStoreBackend {
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private:
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bool ioctl_fiemap;
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bool m_filestore_fiemap;
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bool m_filestore_fsync_flushes_journal_data;
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public:
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GenericFileStoreBackend(FileStore *fs);
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virtual ~GenericFileStoreBackend() {};
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virtual int detect_features();
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virtual int create_current();
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virtual bool can_checkpoint() { return false; };
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virtual int list_checkpoints(list<string>& ls) { return 0; }
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virtual int create_checkpoint(const string& name, uint64_t *cid) { return -EOPNOTSUPP; }
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virtual int sync_checkpoint(uint64_t id) { return -EOPNOTSUPP; }
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virtual int rollback_to(const string& name) { return -EOPNOTSUPP; }
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virtual int destroy_checkpoint(const string& name) { return -EOPNOTSUPP; }
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virtual int syncfs();
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virtual bool has_fiemap() { return ioctl_fiemap; }
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virtual int do_fiemap(int fd, off_t start, size_t len, struct fiemap **pfiemap);
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virtual int clone_range(int from, int to, uint64_t srcoff, uint64_t len, uint64_t dstoff) {
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return _copy_range(from, to, srcoff, len, dstoff);
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}
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virtual int set_alloc_hint(int fd, uint64_t hint) { return -EOPNOTSUPP; }
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private:
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int _crc_load_or_init(int fd, SloppyCRCMap *cm);
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int _crc_save(int fd, SloppyCRCMap *cm);
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public:
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virtual int _crc_update_write(int fd, loff_t off, size_t len, const bufferlist& bl);
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virtual int _crc_update_truncate(int fd, loff_t off);
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virtual int _crc_update_zero(int fd, loff_t off, size_t len);
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virtual int _crc_update_clone_range(int srcfd, int destfd,
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loff_t srcoff, size_t len, loff_t dstoff);
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virtual int _crc_verify_read(int fd, loff_t off, size_t len, const bufferlist& bl,
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ostream *out);
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};
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#endif
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