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b9ae18aa | 1 | /* |
63be0a78 | 2 | * $Id: DiskdIOStrategy.h,v 1.5 2008/02/26 21:49:40 amosjeffries Exp $ |
b9ae18aa | 3 | * |
4 | * DEBUG: section 79 Squid-side DISKD I/O functions. | |
5 | * AUTHOR: Duane Wessels | |
6 | * | |
7 | * SQUID Web Proxy Cache http://www.squid-cache.org/ | |
8 | * ---------------------------------------------------------- | |
9 | * | |
10 | * Squid is the result of efforts by numerous individuals from | |
11 | * the Internet community; see the CONTRIBUTORS file for full | |
12 | * details. Many organizations have provided support for Squid's | |
13 | * development; see the SPONSORS file for full details. Squid is | |
14 | * Copyrighted (C) 2001 by the Regents of the University of | |
15 | * California; see the COPYRIGHT file for full details. Squid | |
16 | * incorporates software developed and/or copyrighted by other | |
17 | * sources; see the CREDITS file for full details. | |
18 | * | |
19 | * This program is free software; you can redistribute it and/or modify | |
20 | * it under the terms of the GNU General Public License as published by | |
21 | * the Free Software Foundation; either version 2 of the License, or | |
22 | * (at your option) any later version. | |
23 | * | |
24 | * This program is distributed in the hope that it will be useful, | |
25 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
26 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27 | * GNU General Public License for more details. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License | |
30 | * along with this program; if not, write to the Free Software | |
31 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. | |
32 | * | |
33 | * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org> | |
34 | */ | |
35 | ||
36 | #ifndef __STORE_DISKDIOSTRATEGY_H__ | |
37 | #define __STORE_DISKDIOSTRATEGY_H__ | |
38 | ||
b9ae18aa | 39 | struct diomsg; |
40 | ||
63be0a78 | 41 | /// \ingroup diskd |
b9ae18aa | 42 | class SharedMemory |
43 | { | |
44 | ||
45 | public: | |
ee139403 | 46 | void put(ssize_t); |
b9ae18aa | 47 | |
ee139403 | 48 | void *get(ssize_t *); |
b9ae18aa | 49 | |
ee139403 | 50 | void init(int ikey, int magic2); |
b9ae18aa | 51 | |
52 | int nbufs; | |
53 | ||
54 | char *buf; | |
55 | ||
56 | char *inuse_map; | |
57 | ||
58 | int id; | |
59 | }; | |
60 | ||
61 | #include "DiskIO/DiskIOStrategy.h" | |
e877aaac | 62 | #include "StoreIOState.h" |
b9ae18aa | 63 | |
64 | class DiskFile; | |
65 | ||
66 | class DiskdFile; | |
67 | ||
68 | class ReadRequest; | |
69 | ||
63be0a78 | 70 | /// \ingroup diskd |
b9ae18aa | 71 | class DiskdIOStrategy : public DiskIOStrategy |
72 | { | |
73 | ||
74 | public: | |
75 | DiskdIOStrategy(); | |
76 | virtual bool shedLoad(); | |
77 | virtual int load(); | |
78 | virtual RefCount<DiskFile> newFile(char const *path); | |
79 | virtual void unlinkFile (char const *); | |
80 | virtual ConfigOption *getOptionTree() const; | |
81 | virtual void init(); | |
82 | virtual void sync(); | |
83 | virtual int callback(); | |
84 | virtual void statfs(StoreEntry & sentry)const; | |
63be0a78 | 85 | int send(int mtype, int id, DiskdFile *theFile, size_t size, off_t offset, ssize_t shm_offset, RefCountable_ *requestor); |
86 | ||
87 | /** public for accessing return address's */ | |
b9ae18aa | 88 | SharedMemory shm; |
89 | ||
90 | private: | |
91 | static size_t newInstance(); | |
92 | static size_t nextInstanceID; | |
93 | void openFailed(); | |
94 | bool optionQ1Parse(char const *option, const char *value, int reconfiguring); | |
95 | void optionQ1Dump(StoreEntry * e) const; | |
96 | bool optionQ2Parse(char const *option, const char *value, int reconfiguring); | |
97 | void optionQ2Dump(StoreEntry * e) const; | |
ee139403 | 98 | int send(int mtype, int id, RefCount<StoreIOState> sio, size_t size, off_t offset, ssize_t shm_offset); |
99 | int SEND(diomsg * M, int mtype, int id, size_t size, off_t offset, ssize_t shm_offset); | |
b9ae18aa | 100 | void handle(diomsg * M); |
101 | void unlinkDone(diomsg * M); | |
63be0a78 | 102 | |
103 | /** | |
104 | * magic1 is the number of messages away which we | |
105 | * stop allowing open/create for. | |
106 | */ | |
b9ae18aa | 107 | int magic1; |
63be0a78 | 108 | |
109 | /** | |
110 | * magic2 is the point at which we start blocking on msgsnd/msgrcv. | |
111 | * If a queue has magic2 (or more) messages away, then we read the | |
112 | * queue until the level falls below magic2. Recommended value | |
113 | * is 75% of SHMBUFS. | |
114 | */ | |
b9ae18aa | 115 | int magic2; |
63be0a78 | 116 | |
b9ae18aa | 117 | int away; |
118 | int smsgid; | |
119 | int rmsgid; | |
120 | int wfd; | |
121 | size_t instanceID; | |
122 | }; | |
123 | ||
63be0a78 | 124 | /// \ingroup diskd |
b9ae18aa | 125 | #define SHMBUF_BLKSZ SM_PAGE_SIZE |
126 | ||
63be0a78 | 127 | /// \ingroup diskd |
b9ae18aa | 128 | struct diskd_stats_t |
129 | { | |
130 | int open_fail_queue_len; | |
131 | int block_queue_len; | |
132 | int max_away; | |
133 | int max_shmuse; | |
134 | int shmbuf_count; | |
135 | int sent_count; | |
136 | int recv_count; | |
137 | int sio_id; | |
138 | ||
139 | struct | |
140 | { | |
141 | int ops; | |
142 | int success; | |
143 | int fail; | |
144 | } | |
145 | ||
146 | open, create, close, unlink, read, write; | |
147 | }; | |
148 | ||
63be0a78 | 149 | /// \ingroup diskd |
b9ae18aa | 150 | extern diskd_stats_t diskd_stats; |
151 | ||
152 | #endif |