root / posix-aio-compat.c @ 4b816985
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1 | 3c529d93 | aliguori | /*
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2 | 3c529d93 | aliguori | * QEMU posix-aio emulation
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3 | 3c529d93 | aliguori | *
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4 | 3c529d93 | aliguori | * Copyright IBM, Corp. 2008
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5 | 3c529d93 | aliguori | *
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6 | 3c529d93 | aliguori | * Authors:
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7 | 3c529d93 | aliguori | * Anthony Liguori <aliguori@us.ibm.com>
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8 | 3c529d93 | aliguori | *
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9 | 3c529d93 | aliguori | * This work is licensed under the terms of the GNU GPL, version 2. See
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10 | 3c529d93 | aliguori | * the COPYING file in the top-level directory.
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11 | 3c529d93 | aliguori | *
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12 | 3c529d93 | aliguori | */
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13 | 3c529d93 | aliguori | |
14 | 221f715d | aliguori | #include <sys/ioctl.h> |
15 | 3c529d93 | aliguori | #include <pthread.h> |
16 | 3c529d93 | aliguori | #include <unistd.h> |
17 | 3c529d93 | aliguori | #include <errno.h> |
18 | 30525aff | malc | #include <time.h> |
19 | 8653c015 | malc | #include <string.h> |
20 | 8653c015 | malc | #include <stdlib.h> |
21 | 8653c015 | malc | #include <stdio.h> |
22 | 3c529d93 | aliguori | #include "osdep.h" |
23 | f141eafe | aliguori | #include "qemu-common.h" |
24 | 3c529d93 | aliguori | |
25 | 3c529d93 | aliguori | #include "posix-aio-compat.h" |
26 | 3c529d93 | aliguori | |
27 | 3c529d93 | aliguori | static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
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28 | 3c529d93 | aliguori | static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
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29 | 3c529d93 | aliguori | static pthread_t thread_id;
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30 | a8227a5a | malc | static pthread_attr_t attr;
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31 | 3c529d93 | aliguori | static int max_threads = 64; |
32 | 3c529d93 | aliguori | static int cur_threads = 0; |
33 | 3c529d93 | aliguori | static int idle_threads = 0; |
34 | 3c529d93 | aliguori | static TAILQ_HEAD(, qemu_paiocb) request_list;
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35 | 3c529d93 | aliguori | |
36 | ceb42de8 | aliguori | #ifdef HAVE_PREADV
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37 | ceb42de8 | aliguori | static int preadv_present = 1; |
38 | ceb42de8 | aliguori | #else
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39 | ceb42de8 | aliguori | static int preadv_present = 0; |
40 | ceb42de8 | aliguori | #endif
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41 | ceb42de8 | aliguori | |
42 | 8653c015 | malc | static void die2(int err, const char *what) |
43 | 8653c015 | malc | { |
44 | 8653c015 | malc | fprintf(stderr, "%s failed: %s\n", what, strerror(err));
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45 | 8653c015 | malc | abort(); |
46 | 8653c015 | malc | } |
47 | 8653c015 | malc | |
48 | 8653c015 | malc | static void die(const char *what) |
49 | 8653c015 | malc | { |
50 | 8653c015 | malc | die2(errno, what); |
51 | 8653c015 | malc | } |
52 | 8653c015 | malc | |
53 | 8653c015 | malc | static void mutex_lock(pthread_mutex_t *mutex) |
54 | 8653c015 | malc | { |
55 | 8653c015 | malc | int ret = pthread_mutex_lock(mutex);
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56 | 8653c015 | malc | if (ret) die2(ret, "pthread_mutex_lock"); |
57 | 8653c015 | malc | } |
58 | 8653c015 | malc | |
59 | 8653c015 | malc | static void mutex_unlock(pthread_mutex_t *mutex) |
60 | 8653c015 | malc | { |
61 | 8653c015 | malc | int ret = pthread_mutex_unlock(mutex);
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62 | 8653c015 | malc | if (ret) die2(ret, "pthread_mutex_unlock"); |
63 | 8653c015 | malc | } |
64 | 8653c015 | malc | |
65 | 8653c015 | malc | static int cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex, |
66 | 8653c015 | malc | struct timespec *ts)
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67 | 8653c015 | malc | { |
68 | 8653c015 | malc | int ret = pthread_cond_timedwait(cond, mutex, ts);
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69 | 8653c015 | malc | if (ret && ret != ETIMEDOUT) die2(ret, "pthread_cond_timedwait"); |
70 | 8653c015 | malc | return ret;
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71 | 8653c015 | malc | } |
72 | 8653c015 | malc | |
73 | 5d47e372 | malc | static void cond_signal(pthread_cond_t *cond) |
74 | 8653c015 | malc | { |
75 | 5d47e372 | malc | int ret = pthread_cond_signal(cond);
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76 | 5d47e372 | malc | if (ret) die2(ret, "pthread_cond_signal"); |
77 | 8653c015 | malc | } |
78 | 8653c015 | malc | |
79 | 8653c015 | malc | static void thread_create(pthread_t *thread, pthread_attr_t *attr, |
80 | 8653c015 | malc | void *(*start_routine)(void*), void *arg) |
81 | 8653c015 | malc | { |
82 | 8653c015 | malc | int ret = pthread_create(thread, attr, start_routine, arg);
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83 | 8653c015 | malc | if (ret) die2(ret, "pthread_create"); |
84 | 8653c015 | malc | } |
85 | 8653c015 | malc | |
86 | f141eafe | aliguori | static size_t handle_aiocb_ioctl(struct qemu_paiocb *aiocb) |
87 | f141eafe | aliguori | { |
88 | f141eafe | aliguori | int ret;
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89 | f141eafe | aliguori | |
90 | f141eafe | aliguori | ret = ioctl(aiocb->aio_fildes, aiocb->aio_ioctl_cmd, aiocb->aio_ioctl_buf); |
91 | f141eafe | aliguori | if (ret == -1) |
92 | f141eafe | aliguori | return -errno;
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93 | e7d54ae8 | Christoph Hellwig | |
94 | e7d54ae8 | Christoph Hellwig | /*
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95 | e7d54ae8 | Christoph Hellwig | * This looks weird, but the aio code only consideres a request
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96 | e7d54ae8 | Christoph Hellwig | * successfull if it has written the number full number of bytes.
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97 | e7d54ae8 | Christoph Hellwig | *
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98 | e7d54ae8 | Christoph Hellwig | * Now we overload aio_nbytes as aio_ioctl_cmd for the ioctl command,
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99 | e7d54ae8 | Christoph Hellwig | * so in fact we return the ioctl command here to make posix_aio_read()
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100 | e7d54ae8 | Christoph Hellwig | * happy..
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101 | e7d54ae8 | Christoph Hellwig | */
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102 | e7d54ae8 | Christoph Hellwig | return aiocb->aio_nbytes;
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103 | f141eafe | aliguori | } |
104 | f141eafe | aliguori | |
105 | ceb42de8 | aliguori | #ifdef HAVE_PREADV
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106 | ceb42de8 | aliguori | |
107 | ceb42de8 | aliguori | static ssize_t
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108 | ceb42de8 | aliguori | qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset) |
109 | ceb42de8 | aliguori | { |
110 | ceb42de8 | aliguori | return preadv(fd, iov, nr_iov, offset);
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111 | ceb42de8 | aliguori | } |
112 | ceb42de8 | aliguori | |
113 | ceb42de8 | aliguori | static ssize_t
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114 | ceb42de8 | aliguori | qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset) |
115 | ceb42de8 | aliguori | { |
116 | ceb42de8 | aliguori | return pwritev(fd, iov, nr_iov, offset);
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117 | ceb42de8 | aliguori | } |
118 | ceb42de8 | aliguori | |
119 | ceb42de8 | aliguori | #else
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120 | ceb42de8 | aliguori | |
121 | ceb42de8 | aliguori | static ssize_t
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122 | ceb42de8 | aliguori | qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset) |
123 | ceb42de8 | aliguori | { |
124 | ceb42de8 | aliguori | return -ENOSYS;
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125 | ceb42de8 | aliguori | } |
126 | ceb42de8 | aliguori | |
127 | ceb42de8 | aliguori | static ssize_t
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128 | ceb42de8 | aliguori | qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset) |
129 | ceb42de8 | aliguori | { |
130 | ceb42de8 | aliguori | return -ENOSYS;
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131 | ceb42de8 | aliguori | } |
132 | ceb42de8 | aliguori | |
133 | ceb42de8 | aliguori | #endif
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134 | ceb42de8 | aliguori | |
135 | f141eafe | aliguori | /*
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136 | f141eafe | aliguori | * Check if we need to copy the data in the aiocb into a new
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137 | f141eafe | aliguori | * properly aligned buffer.
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138 | f141eafe | aliguori | */
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139 | f141eafe | aliguori | static int aiocb_needs_copy(struct qemu_paiocb *aiocb) |
140 | f141eafe | aliguori | { |
141 | f141eafe | aliguori | if (aiocb->aio_flags & QEMU_AIO_SECTOR_ALIGNED) {
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142 | f141eafe | aliguori | int i;
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143 | f141eafe | aliguori | |
144 | f141eafe | aliguori | for (i = 0; i < aiocb->aio_niov; i++) |
145 | f141eafe | aliguori | if ((uintptr_t) aiocb->aio_iov[i].iov_base % 512) |
146 | f141eafe | aliguori | return 1; |
147 | f141eafe | aliguori | } |
148 | f141eafe | aliguori | |
149 | f141eafe | aliguori | return 0; |
150 | f141eafe | aliguori | } |
151 | f141eafe | aliguori | |
152 | ceb42de8 | aliguori | static size_t handle_aiocb_rw_vector(struct qemu_paiocb *aiocb) |
153 | ceb42de8 | aliguori | { |
154 | ceb42de8 | aliguori | size_t offset = 0;
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155 | ceb42de8 | aliguori | ssize_t len; |
156 | ceb42de8 | aliguori | |
157 | ceb42de8 | aliguori | do {
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158 | ceb42de8 | aliguori | if (aiocb->aio_type == QEMU_PAIO_WRITE)
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159 | ceb42de8 | aliguori | len = qemu_pwritev(aiocb->aio_fildes, |
160 | ceb42de8 | aliguori | aiocb->aio_iov, |
161 | ceb42de8 | aliguori | aiocb->aio_niov, |
162 | ceb42de8 | aliguori | aiocb->aio_offset + offset); |
163 | ceb42de8 | aliguori | else
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164 | ceb42de8 | aliguori | len = qemu_preadv(aiocb->aio_fildes, |
165 | ceb42de8 | aliguori | aiocb->aio_iov, |
166 | ceb42de8 | aliguori | aiocb->aio_niov, |
167 | ceb42de8 | aliguori | aiocb->aio_offset + offset); |
168 | ceb42de8 | aliguori | } while (len == -1 && errno == EINTR); |
169 | ceb42de8 | aliguori | |
170 | ceb42de8 | aliguori | if (len == -1) |
171 | ceb42de8 | aliguori | return -errno;
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172 | ceb42de8 | aliguori | return len;
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173 | ceb42de8 | aliguori | } |
174 | ceb42de8 | aliguori | |
175 | f141eafe | aliguori | static size_t handle_aiocb_rw_linear(struct qemu_paiocb *aiocb, char *buf) |
176 | 221f715d | aliguori | { |
177 | 221f715d | aliguori | size_t offset = 0;
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178 | f141eafe | aliguori | size_t len; |
179 | 221f715d | aliguori | |
180 | 221f715d | aliguori | while (offset < aiocb->aio_nbytes) {
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181 | f141eafe | aliguori | if (aiocb->aio_type == QEMU_PAIO_WRITE)
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182 | f141eafe | aliguori | len = pwrite(aiocb->aio_fildes, |
183 | f141eafe | aliguori | (const char *)buf + offset, |
184 | f141eafe | aliguori | aiocb->aio_nbytes - offset, |
185 | f141eafe | aliguori | aiocb->aio_offset + offset); |
186 | f141eafe | aliguori | else
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187 | f141eafe | aliguori | len = pread(aiocb->aio_fildes, |
188 | f141eafe | aliguori | buf + offset, |
189 | 221f715d | aliguori | aiocb->aio_nbytes - offset, |
190 | 221f715d | aliguori | aiocb->aio_offset + offset); |
191 | 221f715d | aliguori | |
192 | f141eafe | aliguori | if (len == -1 && errno == EINTR) |
193 | f141eafe | aliguori | continue;
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194 | f141eafe | aliguori | else if (len == -1) { |
195 | f141eafe | aliguori | offset = -errno; |
196 | f141eafe | aliguori | break;
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197 | f141eafe | aliguori | } else if (len == 0) |
198 | f141eafe | aliguori | break;
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199 | f141eafe | aliguori | |
200 | f141eafe | aliguori | offset += len; |
201 | 221f715d | aliguori | } |
202 | 221f715d | aliguori | |
203 | 221f715d | aliguori | return offset;
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204 | 221f715d | aliguori | } |
205 | 221f715d | aliguori | |
206 | f141eafe | aliguori | static size_t handle_aiocb_rw(struct qemu_paiocb *aiocb) |
207 | 221f715d | aliguori | { |
208 | f141eafe | aliguori | size_t nbytes; |
209 | f141eafe | aliguori | char *buf;
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210 | f141eafe | aliguori | |
211 | ceb42de8 | aliguori | if (!aiocb_needs_copy(aiocb)) {
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212 | f141eafe | aliguori | /*
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213 | f141eafe | aliguori | * If there is just a single buffer, and it is properly aligned
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214 | f141eafe | aliguori | * we can just use plain pread/pwrite without any problems.
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215 | f141eafe | aliguori | */
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216 | ceb42de8 | aliguori | if (aiocb->aio_niov == 1) |
217 | ceb42de8 | aliguori | return handle_aiocb_rw_linear(aiocb, aiocb->aio_iov->iov_base);
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218 | ceb42de8 | aliguori | |
219 | ceb42de8 | aliguori | /*
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220 | ceb42de8 | aliguori | * We have more than one iovec, and all are properly aligned.
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221 | ceb42de8 | aliguori | *
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222 | ceb42de8 | aliguori | * Try preadv/pwritev first and fall back to linearizing the
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223 | ceb42de8 | aliguori | * buffer if it's not supported.
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224 | ceb42de8 | aliguori | */
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225 | ceb42de8 | aliguori | if (preadv_present) {
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226 | ceb42de8 | aliguori | nbytes = handle_aiocb_rw_vector(aiocb); |
227 | ceb42de8 | aliguori | if (nbytes == aiocb->aio_nbytes)
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228 | ceb42de8 | aliguori | return nbytes;
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229 | ceb42de8 | aliguori | if (nbytes < 0 && nbytes != -ENOSYS) |
230 | ceb42de8 | aliguori | return nbytes;
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231 | ceb42de8 | aliguori | preadv_present = 0;
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232 | ceb42de8 | aliguori | } |
233 | ceb42de8 | aliguori | |
234 | ceb42de8 | aliguori | /*
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235 | ceb42de8 | aliguori | * XXX(hch): short read/write. no easy way to handle the reminder
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236 | ceb42de8 | aliguori | * using these interfaces. For now retry using plain
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237 | ceb42de8 | aliguori | * pread/pwrite?
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238 | ceb42de8 | aliguori | */
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239 | f141eafe | aliguori | } |
240 | 221f715d | aliguori | |
241 | f141eafe | aliguori | /*
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242 | f141eafe | aliguori | * Ok, we have to do it the hard way, copy all segments into
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243 | f141eafe | aliguori | * a single aligned buffer.
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244 | f141eafe | aliguori | */
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245 | f141eafe | aliguori | buf = qemu_memalign(512, aiocb->aio_nbytes);
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246 | f141eafe | aliguori | if (aiocb->aio_type == QEMU_PAIO_WRITE) {
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247 | f141eafe | aliguori | char *p = buf;
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248 | f141eafe | aliguori | int i;
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249 | f141eafe | aliguori | |
250 | f141eafe | aliguori | for (i = 0; i < aiocb->aio_niov; ++i) { |
251 | f141eafe | aliguori | memcpy(p, aiocb->aio_iov[i].iov_base, aiocb->aio_iov[i].iov_len); |
252 | f141eafe | aliguori | p += aiocb->aio_iov[i].iov_len; |
253 | f141eafe | aliguori | } |
254 | f141eafe | aliguori | } |
255 | f141eafe | aliguori | |
256 | f141eafe | aliguori | nbytes = handle_aiocb_rw_linear(aiocb, buf); |
257 | f141eafe | aliguori | if (aiocb->aio_type != QEMU_PAIO_WRITE) {
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258 | f141eafe | aliguori | char *p = buf;
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259 | f141eafe | aliguori | size_t count = aiocb->aio_nbytes, copy; |
260 | f141eafe | aliguori | int i;
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261 | f141eafe | aliguori | |
262 | f141eafe | aliguori | for (i = 0; i < aiocb->aio_niov && count; ++i) { |
263 | f141eafe | aliguori | copy = count; |
264 | f141eafe | aliguori | if (copy > aiocb->aio_iov[i].iov_len)
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265 | f141eafe | aliguori | copy = aiocb->aio_iov[i].iov_len; |
266 | f141eafe | aliguori | memcpy(aiocb->aio_iov[i].iov_base, p, copy); |
267 | f141eafe | aliguori | p += copy; |
268 | f141eafe | aliguori | count -= copy; |
269 | f141eafe | aliguori | } |
270 | f141eafe | aliguori | } |
271 | f141eafe | aliguori | qemu_vfree(buf); |
272 | f141eafe | aliguori | |
273 | f141eafe | aliguori | return nbytes;
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274 | 221f715d | aliguori | } |
275 | 221f715d | aliguori | |
276 | 3c529d93 | aliguori | static void *aio_thread(void *unused) |
277 | 3c529d93 | aliguori | { |
278 | a8227a5a | malc | pid_t pid; |
279 | 3c529d93 | aliguori | sigset_t set; |
280 | 3c529d93 | aliguori | |
281 | a8227a5a | malc | pid = getpid(); |
282 | a8227a5a | malc | |
283 | 3c529d93 | aliguori | /* block all signals */
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284 | 8653c015 | malc | if (sigfillset(&set)) die("sigfillset"); |
285 | 8653c015 | malc | if (sigprocmask(SIG_BLOCK, &set, NULL)) die("sigprocmask"); |
286 | 3c529d93 | aliguori | |
287 | 3c529d93 | aliguori | while (1) { |
288 | 3c529d93 | aliguori | struct qemu_paiocb *aiocb;
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289 | 221f715d | aliguori | size_t ret = 0;
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290 | 30525aff | malc | qemu_timeval tv; |
291 | 30525aff | malc | struct timespec ts;
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292 | 30525aff | malc | |
293 | 30525aff | malc | qemu_gettimeofday(&tv); |
294 | 30525aff | malc | ts.tv_sec = tv.tv_sec + 10;
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295 | 30525aff | malc | ts.tv_nsec = 0;
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296 | 3c529d93 | aliguori | |
297 | 8653c015 | malc | mutex_lock(&lock); |
298 | 3c529d93 | aliguori | |
299 | 3c529d93 | aliguori | while (TAILQ_EMPTY(&request_list) &&
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300 | 3c529d93 | aliguori | !(ret == ETIMEDOUT)) { |
301 | 8653c015 | malc | ret = cond_timedwait(&cond, &lock, &ts); |
302 | 3c529d93 | aliguori | } |
303 | 3c529d93 | aliguori | |
304 | 514f7a27 | malc | if (TAILQ_EMPTY(&request_list))
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305 | 3c529d93 | aliguori | break;
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306 | 3c529d93 | aliguori | |
307 | 3c529d93 | aliguori | aiocb = TAILQ_FIRST(&request_list); |
308 | 3c529d93 | aliguori | TAILQ_REMOVE(&request_list, aiocb, node); |
309 | 3c529d93 | aliguori | aiocb->active = 1;
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310 | 3c529d93 | aliguori | idle_threads--; |
311 | 8653c015 | malc | mutex_unlock(&lock); |
312 | 3c529d93 | aliguori | |
313 | 221f715d | aliguori | switch (aiocb->aio_type) {
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314 | 221f715d | aliguori | case QEMU_PAIO_READ:
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315 | 221f715d | aliguori | case QEMU_PAIO_WRITE:
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316 | f141eafe | aliguori | ret = handle_aiocb_rw(aiocb); |
317 | 221f715d | aliguori | break;
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318 | 221f715d | aliguori | case QEMU_PAIO_IOCTL:
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319 | 221f715d | aliguori | ret = handle_aiocb_ioctl(aiocb); |
320 | 221f715d | aliguori | break;
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321 | 221f715d | aliguori | default:
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322 | 221f715d | aliguori | fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
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323 | 221f715d | aliguori | ret = -EINVAL; |
324 | 221f715d | aliguori | break;
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325 | 221f715d | aliguori | } |
326 | 3c529d93 | aliguori | |
327 | 8653c015 | malc | mutex_lock(&lock); |
328 | 221f715d | aliguori | aiocb->ret = ret; |
329 | 3c529d93 | aliguori | idle_threads++; |
330 | 8653c015 | malc | mutex_unlock(&lock); |
331 | 3c529d93 | aliguori | |
332 | a8227a5a | malc | if (kill(pid, aiocb->ev_signo)) die("kill failed"); |
333 | 3c529d93 | aliguori | } |
334 | 3c529d93 | aliguori | |
335 | 3c529d93 | aliguori | idle_threads--; |
336 | 3c529d93 | aliguori | cur_threads--; |
337 | 8653c015 | malc | mutex_unlock(&lock); |
338 | 3c529d93 | aliguori | |
339 | 3c529d93 | aliguori | return NULL; |
340 | 3c529d93 | aliguori | } |
341 | 3c529d93 | aliguori | |
342 | 8653c015 | malc | static void spawn_thread(void) |
343 | 3c529d93 | aliguori | { |
344 | 3c529d93 | aliguori | cur_threads++; |
345 | 3c529d93 | aliguori | idle_threads++; |
346 | 8653c015 | malc | thread_create(&thread_id, &attr, aio_thread, NULL);
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347 | 3c529d93 | aliguori | } |
348 | 3c529d93 | aliguori | |
349 | 3c529d93 | aliguori | int qemu_paio_init(struct qemu_paioinit *aioinit) |
350 | 3c529d93 | aliguori | { |
351 | a8227a5a | malc | int ret;
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352 | a8227a5a | malc | |
353 | a8227a5a | malc | ret = pthread_attr_init(&attr); |
354 | a8227a5a | malc | if (ret) die2(ret, "pthread_attr_init"); |
355 | a8227a5a | malc | |
356 | a8227a5a | malc | ret = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); |
357 | a8227a5a | malc | if (ret) die2(ret, "pthread_attr_setdetachstate"); |
358 | a8227a5a | malc | |
359 | 3c529d93 | aliguori | TAILQ_INIT(&request_list); |
360 | 3c529d93 | aliguori | |
361 | 3c529d93 | aliguori | return 0; |
362 | 3c529d93 | aliguori | } |
363 | 3c529d93 | aliguori | |
364 | 221f715d | aliguori | static int qemu_paio_submit(struct qemu_paiocb *aiocb, int type) |
365 | 3c529d93 | aliguori | { |
366 | 221f715d | aliguori | aiocb->aio_type = type; |
367 | 3c529d93 | aliguori | aiocb->ret = -EINPROGRESS; |
368 | 3c529d93 | aliguori | aiocb->active = 0;
|
369 | 8653c015 | malc | mutex_lock(&lock); |
370 | 3c529d93 | aliguori | if (idle_threads == 0 && cur_threads < max_threads) |
371 | 3c529d93 | aliguori | spawn_thread(); |
372 | 3c529d93 | aliguori | TAILQ_INSERT_TAIL(&request_list, aiocb, node); |
373 | 8653c015 | malc | mutex_unlock(&lock); |
374 | 5d47e372 | malc | cond_signal(&cond); |
375 | 3c529d93 | aliguori | |
376 | 3c529d93 | aliguori | return 0; |
377 | 3c529d93 | aliguori | } |
378 | 3c529d93 | aliguori | |
379 | 3c529d93 | aliguori | int qemu_paio_read(struct qemu_paiocb *aiocb) |
380 | 3c529d93 | aliguori | { |
381 | 221f715d | aliguori | return qemu_paio_submit(aiocb, QEMU_PAIO_READ);
|
382 | 3c529d93 | aliguori | } |
383 | 3c529d93 | aliguori | |
384 | 3c529d93 | aliguori | int qemu_paio_write(struct qemu_paiocb *aiocb) |
385 | 3c529d93 | aliguori | { |
386 | 221f715d | aliguori | return qemu_paio_submit(aiocb, QEMU_PAIO_WRITE);
|
387 | 221f715d | aliguori | } |
388 | 221f715d | aliguori | |
389 | 221f715d | aliguori | int qemu_paio_ioctl(struct qemu_paiocb *aiocb) |
390 | 221f715d | aliguori | { |
391 | 221f715d | aliguori | return qemu_paio_submit(aiocb, QEMU_PAIO_IOCTL);
|
392 | 3c529d93 | aliguori | } |
393 | 3c529d93 | aliguori | |
394 | 3c529d93 | aliguori | ssize_t qemu_paio_return(struct qemu_paiocb *aiocb)
|
395 | 3c529d93 | aliguori | { |
396 | 3c529d93 | aliguori | ssize_t ret; |
397 | 3c529d93 | aliguori | |
398 | 8653c015 | malc | mutex_lock(&lock); |
399 | 3c529d93 | aliguori | ret = aiocb->ret; |
400 | 8653c015 | malc | mutex_unlock(&lock); |
401 | 3c529d93 | aliguori | |
402 | 3c529d93 | aliguori | return ret;
|
403 | 3c529d93 | aliguori | } |
404 | 3c529d93 | aliguori | |
405 | 3c529d93 | aliguori | int qemu_paio_error(struct qemu_paiocb *aiocb) |
406 | 3c529d93 | aliguori | { |
407 | 3c529d93 | aliguori | ssize_t ret = qemu_paio_return(aiocb); |
408 | 3c529d93 | aliguori | |
409 | 3c529d93 | aliguori | if (ret < 0) |
410 | 3c529d93 | aliguori | ret = -ret; |
411 | 3c529d93 | aliguori | else
|
412 | 3c529d93 | aliguori | ret = 0;
|
413 | 3c529d93 | aliguori | |
414 | 3c529d93 | aliguori | return ret;
|
415 | 3c529d93 | aliguori | } |
416 | 3c529d93 | aliguori | |
417 | 3c529d93 | aliguori | int qemu_paio_cancel(int fd, struct qemu_paiocb *aiocb) |
418 | 3c529d93 | aliguori | { |
419 | 3c529d93 | aliguori | int ret;
|
420 | 3c529d93 | aliguori | |
421 | 8653c015 | malc | mutex_lock(&lock); |
422 | 3c529d93 | aliguori | if (!aiocb->active) {
|
423 | 3c529d93 | aliguori | TAILQ_REMOVE(&request_list, aiocb, node); |
424 | 3c529d93 | aliguori | aiocb->ret = -ECANCELED; |
425 | 3c529d93 | aliguori | ret = QEMU_PAIO_CANCELED; |
426 | 3c529d93 | aliguori | } else if (aiocb->ret == -EINPROGRESS) |
427 | 3c529d93 | aliguori | ret = QEMU_PAIO_NOTCANCELED; |
428 | 3c529d93 | aliguori | else
|
429 | 3c529d93 | aliguori | ret = QEMU_PAIO_ALLDONE; |
430 | 8653c015 | malc | mutex_unlock(&lock); |
431 | 3c529d93 | aliguori | |
432 | 3c529d93 | aliguori | return ret;
|
433 | 3c529d93 | aliguori | } |