RockDbCell.h
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1 /*
2  * Copyright (C) 1996-2017 The Squid Software Foundation and contributors
3  *
4  * Squid software is distributed under GPLv2+ license and includes
5  * contributions from numerous individuals and organizations.
6  * Please see the COPYING and CONTRIBUTORS files for details.
7  */
8 
9 #ifndef SQUID_FS_ROCK_DB_CELL_H
10 #define SQUID_FS_ROCK_DB_CELL_H
11 
12 #include "store/forward.h"
13 
14 namespace Rock
15 {
16 
23 {
24 public:
25  DbCellHeader();
26 
28  bool empty() const { return !firstSlot && !nextSlot && !payloadSize; }
29 
30  /* members below are not meaningful if empty() */
31 
33  bool sane(const size_t slotSize, int slotLimit) const {
34  return
35  0 <= firstSlot && firstSlot < slotLimit &&
36  -1 <= nextSlot && nextSlot < slotLimit &&
37  version > 0 &&
38  0 < payloadSize && payloadSize <= slotSize - sizeof(DbCellHeader);
39  }
40 
41  uint64_t key[2];
42  uint64_t entrySize;
43  uint32_t payloadSize;
44  uint32_t version;
47 };
48 
49 } // namespace Rock
50 
51 #endif /* SQUID_FS_ROCK_DB_CELL_H */
52 
uint64_t entrySize
total entry content size or zero if still unknown
Definition: RockDbCell.h:42
sfileno nextSlot
slot ID of the next slot occupied by the entry
Definition: RockDbCell.h:46
bool sane(const size_t slotSize, int slotLimit) const
whether this slot is not corrupted
Definition: RockDbCell.h:33
uint32_t payloadSize
slot contents size, always positive
Definition: RockDbCell.h:43
uint64_t key[2]
StoreEntry key.
Definition: RockDbCell.h:41
bool empty() const
true iff no entry occupies this slot
Definition: RockDbCell.h:28
signed_int32_t sfileno
Definition: forward.h:22
uint32_t version
detects conflicts among same-key entries
Definition: RockDbCell.h:44
sfileno firstSlot
slot ID of the first slot occupied by the entry
Definition: RockDbCell.h:45

 

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