source: squid-ssl/trunk/fuentes/src/DiskIO/AIO/AIODiskFile.cc @ 5495

Last change on this file since 5495 was 5495, checked in by Juanma, 4 years ago

Initial release

File size: 5.5 KB
Line 
1/*
2 * Copyright (C) 1996-2015 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/* DEBUG: section 79    Disk IO Routines */
10
11/**
12 * \par
13 * These routines are simple plugin replacements for the file_* routines
14 * in disk.c . They back-end into the POSIX AIO routines to provide
15 * a nice and simple async IO framework for COSS.
16 *
17 * \par
18 * AIO is suitable for COSS - the only sync operations that the standard
19 * supports are read/write, and since COSS works on a single file
20 * per storedir it should work just fine.
21 */
22
23#include "squid.h"
24#include "AIODiskFile.h"
25#include "AIODiskIOStrategy.h"
26#include "disk.h"
27#include "DiskIO/IORequestor.h"
28#include "DiskIO/ReadRequest.h"
29#include "DiskIO/WriteRequest.h"
30#include "globals.h"
31
32#include <cerrno>
33
34CBDATA_CLASS_INIT(AIODiskFile);
35
36AIODiskFile::AIODiskFile(char const *aPath, AIODiskIOStrategy *aStrategy) : fd(-1), closed(true), error_(false)
37{
38    assert (aPath);
39    path = aPath;
40    strategy = aStrategy;
41    debugs(79, 3, "AIODiskFile::AIODiskFile: " << aPath);
42}
43
44AIODiskFile::~AIODiskFile()
45{}
46
47void
48AIODiskFile::error(bool const &aBool)
49{
50    error_ = aBool;
51}
52
53void
54AIODiskFile::open(int flags, mode_t mode, RefCount<IORequestor> callback)
55{
56    /* Simulate async calls */
57#if _SQUID_WINDOWS_
58    fd = aio_open(path.termedBuf(), flags);
59#else
60    fd = file_open(path.termedBuf() , flags);
61#endif
62
63    ioRequestor = callback;
64
65    if (fd < 0) {
66        debugs(79, 3, HERE << ": got failure (" << errno << ")");
67        error(true);
68    } else {
69        closed = false;
70        ++store_open_disk_fd;
71        debugs(79, 3, HERE << ": opened FD " << fd);
72    }
73
74    callback->ioCompletedNotification();
75}
76
77void
78AIODiskFile::create(int flags, mode_t mode, RefCount<IORequestor> callback)
79{
80    /* We use the same logic path for open */
81    open(flags, mode, callback);
82}
83
84void
85AIODiskFile::read(ReadRequest *request)
86{
87    int slot;
88    async_queue_entry_t *qe;
89
90    assert(strategy->aq.aq_state == AQ_STATE_SETUP);
91
92    /* Find a free slot */
93    slot = strategy->findSlot();
94
95    if (slot < 0) {
96        /* No free slot? Callback error, and return */
97        fatal("Aiee! out of aiocb slots! - FIXME and wrap file_read\n");
98        debugs(79, DBG_IMPORTANT, "WARNING: out of aiocb slots!");
99        /* fall back to blocking method */
100        //        file_read(fd, request->buf, request->len, request->offset, callback, data);
101        return;
102    }
103
104    /* Mark slot as ours */
105    qe = &strategy->aq.aq_queue[slot];
106
107    qe->aq_e_state = AQ_ENTRY_USED;
108
109    qe->aq_e_callback_data = cbdataReference(request);
110
111    qe->theFile = cbdataReference(this);
112
113    qe->aq_e_type = AQ_ENTRY_READ;
114
115    qe->aq_e_free = NULL;
116
117    qe->aq_e_buf =  request->buf;
118
119    qe->aq_e_fd = getFD();
120
121    qe->aq_e_aiocb.aio_fildes = getFD();
122
123    qe->aq_e_aiocb.aio_nbytes = request->len;
124
125    qe->aq_e_aiocb.aio_offset =  request->offset;
126
127    qe->aq_e_aiocb.aio_buf =  request->buf;
128
129    /* Account */
130    ++ strategy->aq.aq_numpending;
131
132    /* Initiate aio */
133    if (aio_read(&qe->aq_e_aiocb) < 0) {
134        fatalf("Aiee! aio_read() returned error (%d)  FIXME and wrap file_read !\n", errno);
135        debugs(79, DBG_IMPORTANT, "WARNING: aio_read() returned error: " << xstrerror());
136        /* fall back to blocking method */
137        //        file_read(fd, request->buf, request->len, request->offset, callback, data);
138    }
139
140}
141
142void
143AIODiskFile::write(WriteRequest *request)
144{
145    int slot;
146    async_queue_entry_t *qe;
147
148    assert(strategy->aq.aq_state == AQ_STATE_SETUP);
149
150    /* Find a free slot */
151    slot = strategy->findSlot();
152
153    if (slot < 0) {
154        /* No free slot? Callback error, and return */
155        fatal("Aiee! out of aiocb slots FIXME and wrap file_write !\n");
156        debugs(79, DBG_IMPORTANT, "WARNING: out of aiocb slots!");
157        /* fall back to blocking method */
158        //        file_write(fd, offset, buf, len, callback, data, freefunc);
159        return;
160    }
161
162    /* Mark slot as ours */
163    qe = &strategy->aq.aq_queue[slot];
164
165    qe->aq_e_state = AQ_ENTRY_USED;
166
167    qe->aq_e_callback_data = cbdataReference(request);
168
169    qe->theFile = cbdataReference(this);
170
171    qe->aq_e_type = AQ_ENTRY_WRITE;
172
173    qe->aq_e_free = request->free_func;
174
175    qe->aq_e_buf = (void *)request->buf;
176
177    qe->aq_e_fd = fd;
178
179    qe->aq_e_aiocb.aio_fildes = fd;
180
181    qe->aq_e_aiocb.aio_nbytes = request->len;
182
183    qe->aq_e_aiocb.aio_offset = request->offset;
184
185    qe->aq_e_aiocb.aio_buf = (void *)request->buf;
186
187    /* Account */
188    ++strategy->aq.aq_numpending;
189
190    /* Initiate aio */
191    if (aio_write(&qe->aq_e_aiocb) < 0) {
192        fatalf("Aiee! aio_write() returned error (%d) FIXME and wrap file_write !\n", errno);
193        debugs(79, DBG_IMPORTANT, "WARNING: aio_write() returned error: " << xstrerror());
194        /* fall back to blocking method */
195        //       file_write(fd, offset, buf, len, callback, data, freefunc);
196    }
197}
198
199void
200AIODiskFile::close ()
201{
202    assert (!closed);
203#if _SQUID_WINDOWS_
204    aio_close(fd);
205#else
206    file_close(fd);
207#endif
208
209    fd = -1;
210    closed = true;
211    assert (ioRequestor != NULL);
212    ioRequestor->closeCompleted();
213}
214
215bool
216AIODiskFile::canRead() const
217{
218    return true;
219}
220
221bool
222AIODiskFile::canWrite() const
223{
224    return true;
225}
226
227int
228AIODiskFile::getFD() const
229{
230    return fd;
231}
232
233bool
234AIODiskFile::error() const
235{
236    return error_;
237}
238
239bool
240AIODiskFile::ioInProgress() const
241{
242    return false;
243}
244
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