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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | #ifndef CEPH_OSDC_WRITEBACKHANDLER_H | |
4 | #define CEPH_OSDC_WRITEBACKHANDLER_H | |
5 | ||
6 | #include "include/Context.h" | |
7 | #include "include/types.h" | |
8 | #include "osd/osd_types.h" | |
9 | ||
10 | class WritebackHandler { | |
11 | public: | |
12 | WritebackHandler() {} | |
13 | virtual ~WritebackHandler() {} | |
14 | ||
15 | virtual void read(const object_t& oid, uint64_t object_no, | |
16 | const object_locator_t& oloc, uint64_t off, uint64_t len, | |
17 | snapid_t snapid, bufferlist *pbl, uint64_t trunc_size, | |
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18 | __u32 trunc_seq, int op_flags, |
19 | const ZTracer::Trace &parent_trace, Context *onfinish) = 0; | |
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20 | /** |
21 | * check if a given extent read result may change due to a write | |
22 | * | |
23 | * Check if the content we see at the given read offset may change | |
24 | * due to a write to this object. | |
25 | * | |
26 | * @param oid object | |
27 | * @param read_off read offset | |
28 | * @param read_len read length | |
29 | * @param snapid read snapid | |
30 | */ | |
31 | virtual bool may_copy_on_write(const object_t& oid, uint64_t read_off, | |
32 | uint64_t read_len, snapid_t snapid) = 0; | |
33 | virtual ceph_tid_t write(const object_t& oid, const object_locator_t& oloc, | |
34 | uint64_t off, uint64_t len, | |
35 | const SnapContext& snapc, | |
36 | const bufferlist &bl, ceph::real_time mtime, | |
37 | uint64_t trunc_size, __u32 trunc_seq, | |
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38 | ceph_tid_t journal_tid, |
39 | const ZTracer::Trace &parent_trace, | |
40 | Context *oncommit) = 0; | |
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41 | |
42 | virtual void overwrite_extent(const object_t& oid, uint64_t off, uint64_t len, | |
43 | ceph_tid_t original_journal_tid, | |
44 | ceph_tid_t new_journal_tid) {} | |
45 | ||
46 | virtual bool can_scattered_write() { return false; } | |
47 | virtual ceph_tid_t write(const object_t& oid, const object_locator_t& oloc, | |
48 | vector<pair<uint64_t, bufferlist> >& io_vec, | |
49 | const SnapContext& snapc, ceph::real_time mtime, | |
50 | uint64_t trunc_size, __u32 trunc_seq, | |
51 | Context *oncommit) { | |
52 | return 0; | |
53 | } | |
54 | }; | |
55 | ||
56 | #endif |