1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#ifndef CEPH_OSDC_WRITEBACKHANDLER_H
#define CEPH_OSDC_WRITEBACKHANDLER_H
#include "include/Context.h"
#include "include/types.h"
#include "osd/osd_types.h"
class WritebackHandler {
public:
WritebackHandler() {}
virtual ~WritebackHandler() {}
virtual tid_t read(const object_t& oid, const object_locator_t& oloc,
uint64_t off, uint64_t len, snapid_t snapid,
bufferlist *pbl, uint64_t trunc_size, __u32 trunc_seq,
Context *onfinish) = 0;
/**
* check if a given extent read result may change due to a write
*
* Check if the content we see at the given read offset may change due to a write to
* this object.
*
* @param oid object
* @param read_off read offset
* @param read_len read length
* @param snapid read snapid
*/
virtual bool may_copy_on_write(const object_t& oid, uint64_t read_off, uint64_t read_len, snapid_t snapid) = 0;
virtual tid_t write(const object_t& oid, const object_locator_t& oloc,
uint64_t off, uint64_t len, const SnapContext& snapc,
const bufferlist &bl, utime_t mtime, uint64_t trunc_size,
__u32 trunc_seq, Context *oncommit) = 0;
virtual tid_t lock(const object_t& oid, const object_locator_t& oloc, int op,
int flags, Context *onack, Context *oncommit) {
assert(0 == "this WritebackHandler does not support the lock operation");
}
};
#endif
|
