source: trunk/libtransmission/fdlimit.h @ 11817

Last change on this file since 11817 was 11817, checked in by jordan, 11 years ago

(trunk libT) #3973 "JIT verification verifies fresh downloaded torrents" -- improvement to r11813.

r11813 fixed the timestamp issue by fsync()ing files before close()ing them in tr_close_file(). This causes a little overhead as even read-only files cause a sync as their atimes are modified. Instead, we should call fsync() further back in the call chain in tr_fdFileClose() so that we can know to only sync torrent files that were opened with write access.

  • Property svn:keywords set to Date Rev Author Id
File size: 3.7 KB
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1/*
2 * This file Copyright (C) Mnemosyne LLC
3 *
4 * This file is licensed by the GPL version 2. Works owned by the
5 * Transmission project are granted a special exemption to clause 2(b)
6 * so that the bulk of its code can remain under the MIT license.
7 * This exemption does not extend to derived works not owned by
8 * the Transmission project.
9 *
10 * $Id: fdlimit.h 11817 2011-02-02 23:29:17Z jordan $
11 */
12
13#ifndef __TRANSMISSION__
14 #error only libtransmission should #include this header.
15#endif
16
17#include "transmission.h"
18#include "net.h"
19
20/**
21 * @addtogroup file_io File IO
22 * @{
23 */
24
25void tr_fdSetFileLimit( tr_session * session, int limit );
26
27int tr_fdGetFileLimit( tr_session * session );
28
29void tr_fdSetGlobalPeerLimit( tr_session * session, int limit );
30
31/***
32****
33***/
34
35void tr_set_file_for_single_pass( int fd );
36
37int tr_open_file_for_scanning( const char * filename );
38
39int tr_open_file_for_writing( const char * filename );
40
41void tr_close_file( int fd );
42
43int tr_fsync(int fd);
44
45ssize_t tr_pread(int fd, void *buf, size_t count, off_t offset);
46ssize_t tr_pwrite(int fd, const void *buf, size_t count, off_t offset);
47int tr_prefetch(int fd, off_t offset, size_t count);
48
49
50/**
51 * Returns an fd to the specified filename.
52 *
53 * A small pool of open files is kept to avoid the overhead of
54 * continually opening and closing the same files when downloading
55 * piece data.
56 *
57 * - if doWrite is true, subfolders in torrentFile are created if necessary.
58 * - if doWrite is true, the target file is created if necessary.
59 *
60 * on success, a file descriptor >= 0 is returned.
61 * on failure, a -1 is returned and errno is set.
62 *
63 * @see tr_fdFileClose
64 */
65int  tr_fdFileCheckout( tr_session             * session,
66                        int                      torrentId,
67                        tr_file_index_t          fileNum,
68                        const char             * fileName,
69                        tr_bool                  doWrite,
70                        tr_preallocation_mode    preallocationMode,
71                        uint64_t                 desiredFileSize );
72
73int tr_fdFileGetCached( tr_session             * session,
74                        int                      torrentId,
75                        tr_file_index_t          fileNum,
76                        tr_bool                  doWrite );
77
78/**
79 * Closes a file that's being held by our file repository.
80 *
81 * If the file isn't checked out, it's fsync()ed and close()d immediately.
82 * If the file is currently checked out, it will be closed upon its return.
83 *
84 * @see tr_fdFileCheckout
85 */
86void tr_fdFileClose( tr_session        * session,
87                     const tr_torrent  * tor,
88                     tr_file_index_t     fileNo );
89
90
91/**
92 * Closes all the files associated with a given torrent id
93 */
94void tr_fdTorrentClose( tr_session * session, int torrentId );
95
96
97/***********************************************************************
98 * Sockets
99 **********************************************************************/
100int      tr_fdSocketCreate( tr_session * session, int domain, int type );
101
102int      tr_fdSocketAccept( tr_session  * session,
103                            int           listening_sockfd,
104                            tr_address  * addr,
105                            tr_port     * port );
106
107void     tr_fdSocketClose( tr_session * session, int s );
108
109/***********************************************************************
110 * tr_fdClose
111 ***********************************************************************
112 * Frees resources allocated by tr_fdInit.
113 **********************************************************************/
114void     tr_fdClose( tr_session * session );
115
116
117void     tr_fdSetPeerLimit( tr_session * session, int n );
118
119int      tr_fdGetPeerLimit( const tr_session * );
120
121/* @} */
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