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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 | /* | |
4 | * Ceph - scalable distributed file system | |
5 | * | |
6 | * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net> | |
7 | * | |
8 | * This is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License version 2.1, as published by the Free Software | |
11 | * Foundation. See file COPYING. | |
12 | * | |
13 | */ | |
14 | #ifndef OS_INDEXMANAGER_H | |
15 | #define OS_INDEXMANAGER_H | |
16 | ||
17 | #include "include/memory.h" | |
18 | #include "include/unordered_map.h" | |
19 | ||
20 | #include "common/Mutex.h" | |
21 | #include "common/Cond.h" | |
22 | #include "common/config.h" | |
23 | #include "common/debug.h" | |
24 | ||
25 | #include "CollectionIndex.h" | |
26 | #include "HashIndex.h" | |
27 | ||
28 | ||
29 | /// Public type for Index | |
30 | struct Index { | |
31 | CollectionIndex *index; | |
32 | ||
33 | Index() : index(NULL) {} | |
34 | explicit Index(CollectionIndex* index) : index(index) {} | |
35 | ||
36 | CollectionIndex *operator->() { return index; } | |
37 | CollectionIndex &operator*() { return *index; } | |
38 | }; | |
39 | ||
40 | ||
41 | /** | |
42 | * Encapsulates mutual exclusion for CollectionIndexes. | |
43 | * | |
44 | * Allowing a modification (removal or addition of an object) to occur | |
45 | * while a read is occuring (lookup of an object's path and use of | |
46 | * that path) may result in the path becoming invalid. Thus, during | |
47 | * the lifetime of a CollectionIndex object and any paths returned | |
48 | * by it, no other concurrent accesses may be allowed. | |
49 | * This is enforced by using CollectionIndex::access_lock | |
50 | */ | |
51 | class IndexManager { | |
52 | CephContext* cct; | |
53 | RWLock lock; ///< Lock for Index Manager | |
54 | bool upgrade; | |
55 | ceph::unordered_map<coll_t, CollectionIndex* > col_indices; | |
56 | ||
57 | /** | |
58 | * Index factory | |
59 | * | |
60 | * Encapsulates logic for handling legacy FileStore | |
61 | * layouts | |
62 | * | |
63 | * @param [in] c Collection for which to get index | |
64 | * @param [in] path Path to collection | |
65 | * @param [out] index Index for c | |
66 | * @return error code | |
67 | */ | |
68 | int build_index(coll_t c, const char *path, CollectionIndex **index); | |
69 | bool get_index_optimistic(coll_t c, Index *index); | |
70 | public: | |
71 | /// Constructor | |
72 | explicit IndexManager(CephContext* cct, | |
73 | bool upgrade) : cct(cct), | |
74 | lock("IndexManager lock"), | |
75 | upgrade(upgrade) {} | |
76 | ||
77 | ~IndexManager(); | |
78 | ||
79 | /** | |
80 | * Reserve and return index for c | |
81 | * | |
82 | * @param [in] c Collection for which to get index | |
83 | * @param [in] baseDir base directory of collections | |
84 | * @param [out] index Index for c | |
85 | * @return error code | |
86 | */ | |
87 | int get_index(coll_t c, const string& baseDir, Index *index); | |
88 | ||
89 | /** | |
90 | * Initialize index for collection c at path | |
91 | * | |
92 | * @param [in] c Collection for which to init Index | |
93 | * @param [in] path Path to collection | |
94 | * @param [in] filestore_version version of containing FileStore | |
95 | * @return error code | |
96 | */ | |
97 | int init_index(coll_t c, const char *path, uint32_t filestore_version); | |
98 | }; | |
99 | ||
100 | #endif |