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1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:nil -*- |
2 | // vim: ts=8 sw=2 smarttab expandtab | |
3 | ||
4 | #pragma once | |
5 | ||
6 | #include <optional> | |
7 | #include <seastar/core/circular_buffer.hh> | |
8 | #include <seastar/core/metrics.hh> | |
9 | #include <seastar/core/shared_future.hh> | |
10 | ||
11 | #include "include/buffer.h" | |
12 | ||
13 | #include "crimson/common/errorator.h" | |
14 | #include "crimson/os/seastore/segment_manager_group.h" | |
15 | #include "crimson/os/seastore/segment_seq_allocator.h" | |
16 | #include "crimson/os/seastore/journal/record_submitter.h" | |
17 | #include "crimson/os/seastore/async_cleaner.h" | |
18 | ||
19 | namespace crimson::os::seastore { | |
20 | class SegmentProvider; | |
21 | class JournalTrimmer; | |
22 | } | |
23 | ||
24 | namespace crimson::os::seastore::journal { | |
25 | ||
26 | /** | |
27 | * SegmentAllocator | |
28 | * | |
29 | * Maintain an available segment for writes. | |
30 | */ | |
31 | class SegmentAllocator : public JournalAllocator { | |
32 | ||
33 | public: | |
34 | // SegmentAllocator specific methods | |
35 | SegmentAllocator(JournalTrimmer *trimmer, | |
36 | data_category_t category, | |
37 | rewrite_gen_t gen, | |
38 | SegmentProvider &sp, | |
39 | SegmentSeqAllocator &ssa); | |
40 | ||
41 | segment_id_t get_segment_id() const { | |
42 | assert(can_write()); | |
43 | return current_segment->get_segment_id(); | |
44 | } | |
45 | ||
46 | extent_len_t get_max_write_length() const { | |
47 | return sm_group.get_segment_size() - | |
48 | sm_group.get_rounded_header_length() - | |
49 | sm_group.get_rounded_tail_length(); | |
50 | } | |
51 | ||
52 | public: | |
53 | // overriding methods | |
54 | const std::string& get_name() const final { | |
55 | return print_name; | |
56 | } | |
57 | ||
58 | extent_len_t get_block_size() const final { | |
59 | return sm_group.get_block_size(); | |
60 | } | |
61 | ||
62 | bool can_write() const final { | |
63 | return !!current_segment; | |
64 | } | |
65 | ||
66 | segment_nonce_t get_nonce() const final { | |
67 | assert(can_write()); | |
68 | return current_segment_nonce; | |
69 | } | |
70 | ||
71 | // returns true iff the current segment has insufficient space | |
72 | bool needs_roll(std::size_t length) const final { | |
73 | assert(can_write()); | |
74 | assert(current_segment->get_write_capacity() == | |
75 | sm_group.get_segment_size()); | |
76 | auto write_capacity = current_segment->get_write_capacity() - | |
77 | sm_group.get_rounded_tail_length(); | |
78 | return length + written_to > std::size_t(write_capacity); | |
79 | } | |
80 | ||
81 | // open for write and generate the correct print name | |
82 | open_ret open(bool is_mkfs) final; | |
83 | ||
84 | // close the current segment and initialize next one | |
85 | roll_ertr::future<> roll() final; | |
86 | ||
87 | // write the buffer, return the write result | |
88 | // | |
89 | // May be called concurrently, but writes may complete in any order. | |
90 | // If rolling/opening, no write is allowed. | |
91 | write_ret write(ceph::bufferlist&& to_write) final; | |
92 | ||
93 | using close_ertr = base_ertr; | |
94 | close_ertr::future<> close() final; | |
95 | ||
96 | void update_modify_time(record_t& record) final { | |
97 | segment_provider.update_modify_time( | |
98 | get_segment_id(), | |
99 | record.modify_time, | |
100 | record.extents.size()); | |
101 | } | |
102 | ||
103 | private: | |
104 | open_ret do_open(bool is_mkfs); | |
105 | ||
106 | void reset() { | |
107 | current_segment.reset(); | |
108 | written_to = 0; | |
109 | ||
110 | current_segment_nonce = 0; | |
111 | } | |
112 | ||
113 | using close_segment_ertr = base_ertr; | |
114 | close_segment_ertr::future<> close_segment(); | |
115 | ||
116 | // device id is not available during construction, | |
117 | // so generate the print_name later. | |
118 | std::string print_name; | |
119 | const segment_type_t type; // JOURNAL or OOL | |
120 | const data_category_t category; | |
121 | const rewrite_gen_t gen; | |
122 | SegmentProvider &segment_provider; | |
123 | SegmentManagerGroup &sm_group; | |
124 | SegmentRef current_segment; | |
125 | segment_off_t written_to; | |
126 | SegmentSeqAllocator &segment_seq_allocator; | |
127 | segment_nonce_t current_segment_nonce; | |
128 | JournalTrimmer *trimmer; | |
129 | }; | |
130 | ||
131 | } |