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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 | 6b620ca3 | Paolo Bonzini | * Contributions after 2012-01-13 are licensed under the terms of the
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13 | 6b620ca3 | Paolo Bonzini | * GNU GPL, version 2 or (at your option) any later version.
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14 | 3c529d93 | aliguori | */
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15 | 3c529d93 | aliguori | |
16 | 221f715d | aliguori | #include <sys/ioctl.h> |
17 | 9ef91a67 | Christoph Hellwig | #include <sys/types.h> |
18 | 3c529d93 | aliguori | #include <pthread.h> |
19 | 3c529d93 | aliguori | #include <unistd.h> |
20 | 3c529d93 | aliguori | #include <errno.h> |
21 | 30525aff | malc | #include <time.h> |
22 | 8653c015 | malc | #include <string.h> |
23 | 8653c015 | malc | #include <stdlib.h> |
24 | 8653c015 | malc | #include <stdio.h> |
25 | 9ef91a67 | Christoph Hellwig | |
26 | 72cf2d4f | Blue Swirl | #include "qemu-queue.h" |
27 | 3c529d93 | aliguori | #include "osdep.h" |
28 | dc786bc9 | Jes Sorensen | #include "sysemu.h" |
29 | f141eafe | aliguori | #include "qemu-common.h" |
30 | 6d519a5f | Stefan Hajnoczi | #include "trace.h" |
31 | 9ef91a67 | Christoph Hellwig | #include "block_int.h" |
32 | 9ef91a67 | Christoph Hellwig | |
33 | 9ef91a67 | Christoph Hellwig | #include "block/raw-posix-aio.h" |
34 | 9ef91a67 | Christoph Hellwig | |
35 | e4ea78ee | Avi Kivity | static void do_spawn_thread(void); |
36 | 9ef91a67 | Christoph Hellwig | |
37 | 9ef91a67 | Christoph Hellwig | struct qemu_paiocb {
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38 | 9ef91a67 | Christoph Hellwig | BlockDriverAIOCB common; |
39 | 9ef91a67 | Christoph Hellwig | int aio_fildes;
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40 | 9ef91a67 | Christoph Hellwig | union {
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41 | 9ef91a67 | Christoph Hellwig | struct iovec *aio_iov;
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42 | b587a52c | Stefan Hajnoczi | void *aio_ioctl_buf;
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43 | 9ef91a67 | Christoph Hellwig | }; |
44 | 9ef91a67 | Christoph Hellwig | int aio_niov;
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45 | 9ef91a67 | Christoph Hellwig | size_t aio_nbytes; |
46 | 9ef91a67 | Christoph Hellwig | #define aio_ioctl_cmd aio_nbytes /* for QEMU_AIO_IOCTL */ |
47 | 9ef91a67 | Christoph Hellwig | off_t aio_offset; |
48 | 9ef91a67 | Christoph Hellwig | |
49 | 72cf2d4f | Blue Swirl | QTAILQ_ENTRY(qemu_paiocb) node; |
50 | 9ef91a67 | Christoph Hellwig | int aio_type;
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51 | 9ef91a67 | Christoph Hellwig | ssize_t ret; |
52 | 9ef91a67 | Christoph Hellwig | int active;
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53 | 9ef91a67 | Christoph Hellwig | struct qemu_paiocb *next;
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54 | 9ef91a67 | Christoph Hellwig | }; |
55 | 9ef91a67 | Christoph Hellwig | |
56 | 9ef91a67 | Christoph Hellwig | typedef struct PosixAioState { |
57 | 9ef91a67 | Christoph Hellwig | int rfd, wfd;
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58 | 9ef91a67 | Christoph Hellwig | struct qemu_paiocb *first_aio;
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59 | 9ef91a67 | Christoph Hellwig | } PosixAioState; |
60 | 3c529d93 | aliguori | |
61 | 3c529d93 | aliguori | |
62 | 3c529d93 | aliguori | static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
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63 | 3c529d93 | aliguori | static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
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64 | 3c529d93 | aliguori | static pthread_t thread_id;
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65 | a8227a5a | malc | static pthread_attr_t attr;
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66 | 3c529d93 | aliguori | static int max_threads = 64; |
67 | 3c529d93 | aliguori | static int cur_threads = 0; |
68 | 3c529d93 | aliguori | static int idle_threads = 0; |
69 | e4ea78ee | Avi Kivity | static int new_threads = 0; /* backlog of threads we need to create */ |
70 | e4ea78ee | Avi Kivity | static int pending_threads = 0; /* threads created but not running yet */ |
71 | e4ea78ee | Avi Kivity | static QEMUBH *new_thread_bh;
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72 | 72cf2d4f | Blue Swirl | static QTAILQ_HEAD(, qemu_paiocb) request_list;
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73 | 3c529d93 | aliguori | |
74 | 2341f9a1 | Juan Quintela | #ifdef CONFIG_PREADV
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75 | ceb42de8 | aliguori | static int preadv_present = 1; |
76 | ceb42de8 | aliguori | #else
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77 | ceb42de8 | aliguori | static int preadv_present = 0; |
78 | ceb42de8 | aliguori | #endif
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79 | ceb42de8 | aliguori | |
80 | 8653c015 | malc | static void die2(int err, const char *what) |
81 | 8653c015 | malc | { |
82 | 8653c015 | malc | fprintf(stderr, "%s failed: %s\n", what, strerror(err));
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83 | 8653c015 | malc | abort(); |
84 | 8653c015 | malc | } |
85 | 8653c015 | malc | |
86 | 8653c015 | malc | static void die(const char *what) |
87 | 8653c015 | malc | { |
88 | 8653c015 | malc | die2(errno, what); |
89 | 8653c015 | malc | } |
90 | 8653c015 | malc | |
91 | 8653c015 | malc | static void mutex_lock(pthread_mutex_t *mutex) |
92 | 8653c015 | malc | { |
93 | 8653c015 | malc | int ret = pthread_mutex_lock(mutex);
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94 | 8653c015 | malc | if (ret) die2(ret, "pthread_mutex_lock"); |
95 | 8653c015 | malc | } |
96 | 8653c015 | malc | |
97 | 8653c015 | malc | static void mutex_unlock(pthread_mutex_t *mutex) |
98 | 8653c015 | malc | { |
99 | 8653c015 | malc | int ret = pthread_mutex_unlock(mutex);
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100 | 8653c015 | malc | if (ret) die2(ret, "pthread_mutex_unlock"); |
101 | 8653c015 | malc | } |
102 | 8653c015 | malc | |
103 | 8653c015 | malc | static int cond_timedwait(pthread_cond_t *cond, pthread_mutex_t *mutex, |
104 | 8653c015 | malc | struct timespec *ts)
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105 | 8653c015 | malc | { |
106 | 8653c015 | malc | int ret = pthread_cond_timedwait(cond, mutex, ts);
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107 | 8653c015 | malc | if (ret && ret != ETIMEDOUT) die2(ret, "pthread_cond_timedwait"); |
108 | 8653c015 | malc | return ret;
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109 | 8653c015 | malc | } |
110 | 8653c015 | malc | |
111 | 5d47e372 | malc | static void cond_signal(pthread_cond_t *cond) |
112 | 8653c015 | malc | { |
113 | 5d47e372 | malc | int ret = pthread_cond_signal(cond);
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114 | 5d47e372 | malc | if (ret) die2(ret, "pthread_cond_signal"); |
115 | 8653c015 | malc | } |
116 | 8653c015 | malc | |
117 | 8653c015 | malc | static void thread_create(pthread_t *thread, pthread_attr_t *attr, |
118 | 8653c015 | malc | void *(*start_routine)(void*), void *arg) |
119 | 8653c015 | malc | { |
120 | 8653c015 | malc | int ret = pthread_create(thread, attr, start_routine, arg);
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121 | 8653c015 | malc | if (ret) die2(ret, "pthread_create"); |
122 | 8653c015 | malc | } |
123 | 8653c015 | malc | |
124 | 6769da29 | Kevin Wolf | static ssize_t handle_aiocb_ioctl(struct qemu_paiocb *aiocb) |
125 | f141eafe | aliguori | { |
126 | b587a52c | Stefan Hajnoczi | int ret;
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127 | b587a52c | Stefan Hajnoczi | |
128 | b587a52c | Stefan Hajnoczi | ret = ioctl(aiocb->aio_fildes, aiocb->aio_ioctl_cmd, aiocb->aio_ioctl_buf); |
129 | b587a52c | Stefan Hajnoczi | if (ret == -1) |
130 | b587a52c | Stefan Hajnoczi | return -errno;
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131 | b587a52c | Stefan Hajnoczi | |
132 | b587a52c | Stefan Hajnoczi | /*
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133 | e7d81004 | Stefan Weil | * This looks weird, but the aio code only considers a request
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134 | e7d81004 | Stefan Weil | * successful if it has written the full number of bytes.
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135 | b587a52c | Stefan Hajnoczi | *
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136 | b587a52c | Stefan Hajnoczi | * Now we overload aio_nbytes as aio_ioctl_cmd for the ioctl command,
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137 | b587a52c | Stefan Hajnoczi | * so in fact we return the ioctl command here to make posix_aio_read()
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138 | b587a52c | Stefan Hajnoczi | * happy..
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139 | b587a52c | Stefan Hajnoczi | */
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140 | b587a52c | Stefan Hajnoczi | return aiocb->aio_nbytes;
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141 | f141eafe | aliguori | } |
142 | f141eafe | aliguori | |
143 | 6769da29 | Kevin Wolf | static ssize_t handle_aiocb_flush(struct qemu_paiocb *aiocb) |
144 | b2e12bc6 | Christoph Hellwig | { |
145 | b2e12bc6 | Christoph Hellwig | int ret;
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146 | b2e12bc6 | Christoph Hellwig | |
147 | 47faadc6 | Blue Swirl | ret = qemu_fdatasync(aiocb->aio_fildes); |
148 | b2e12bc6 | Christoph Hellwig | if (ret == -1) |
149 | b2e12bc6 | Christoph Hellwig | return -errno;
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150 | b2e12bc6 | Christoph Hellwig | return 0; |
151 | b2e12bc6 | Christoph Hellwig | } |
152 | b2e12bc6 | Christoph Hellwig | |
153 | 2341f9a1 | Juan Quintela | #ifdef CONFIG_PREADV
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154 | ceb42de8 | aliguori | |
155 | ceb42de8 | aliguori | static ssize_t
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156 | ceb42de8 | aliguori | qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset) |
157 | ceb42de8 | aliguori | { |
158 | ceb42de8 | aliguori | return preadv(fd, iov, nr_iov, offset);
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159 | ceb42de8 | aliguori | } |
160 | ceb42de8 | aliguori | |
161 | ceb42de8 | aliguori | static ssize_t
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162 | ceb42de8 | aliguori | qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset) |
163 | ceb42de8 | aliguori | { |
164 | ceb42de8 | aliguori | return pwritev(fd, iov, nr_iov, offset);
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165 | ceb42de8 | aliguori | } |
166 | ceb42de8 | aliguori | |
167 | ceb42de8 | aliguori | #else
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168 | ceb42de8 | aliguori | |
169 | ceb42de8 | aliguori | static ssize_t
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170 | ceb42de8 | aliguori | qemu_preadv(int fd, const struct iovec *iov, int nr_iov, off_t offset) |
171 | ceb42de8 | aliguori | { |
172 | ceb42de8 | aliguori | return -ENOSYS;
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173 | ceb42de8 | aliguori | } |
174 | ceb42de8 | aliguori | |
175 | ceb42de8 | aliguori | static ssize_t
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176 | ceb42de8 | aliguori | qemu_pwritev(int fd, const struct iovec *iov, int nr_iov, off_t offset) |
177 | ceb42de8 | aliguori | { |
178 | ceb42de8 | aliguori | return -ENOSYS;
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179 | ceb42de8 | aliguori | } |
180 | ceb42de8 | aliguori | |
181 | ceb42de8 | aliguori | #endif
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182 | ceb42de8 | aliguori | |
183 | 6769da29 | Kevin Wolf | static ssize_t handle_aiocb_rw_vector(struct qemu_paiocb *aiocb) |
184 | ceb42de8 | aliguori | { |
185 | ceb42de8 | aliguori | ssize_t len; |
186 | ceb42de8 | aliguori | |
187 | ceb42de8 | aliguori | do {
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188 | 9ef91a67 | Christoph Hellwig | if (aiocb->aio_type & QEMU_AIO_WRITE)
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189 | ceb42de8 | aliguori | len = qemu_pwritev(aiocb->aio_fildes, |
190 | ceb42de8 | aliguori | aiocb->aio_iov, |
191 | ceb42de8 | aliguori | aiocb->aio_niov, |
192 | 21cfa41e | Frediano Ziglio | aiocb->aio_offset); |
193 | ceb42de8 | aliguori | else
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194 | ceb42de8 | aliguori | len = qemu_preadv(aiocb->aio_fildes, |
195 | ceb42de8 | aliguori | aiocb->aio_iov, |
196 | ceb42de8 | aliguori | aiocb->aio_niov, |
197 | 21cfa41e | Frediano Ziglio | aiocb->aio_offset); |
198 | ceb42de8 | aliguori | } while (len == -1 && errno == EINTR); |
199 | ceb42de8 | aliguori | |
200 | ceb42de8 | aliguori | if (len == -1) |
201 | ceb42de8 | aliguori | return -errno;
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202 | ceb42de8 | aliguori | return len;
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203 | ceb42de8 | aliguori | } |
204 | ceb42de8 | aliguori | |
205 | ba1d1afd | Kevin Wolf | /*
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206 | ba1d1afd | Kevin Wolf | * Read/writes the data to/from a given linear buffer.
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207 | ba1d1afd | Kevin Wolf | *
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208 | ba1d1afd | Kevin Wolf | * Returns the number of bytes handles or -errno in case of an error. Short
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209 | ba1d1afd | Kevin Wolf | * reads are only returned if the end of the file is reached.
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210 | ba1d1afd | Kevin Wolf | */
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211 | 6769da29 | Kevin Wolf | static ssize_t handle_aiocb_rw_linear(struct qemu_paiocb *aiocb, char *buf) |
212 | 221f715d | aliguori | { |
213 | 6769da29 | Kevin Wolf | ssize_t offset = 0;
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214 | 6769da29 | Kevin Wolf | ssize_t len; |
215 | 221f715d | aliguori | |
216 | 221f715d | aliguori | while (offset < aiocb->aio_nbytes) {
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217 | 9ef91a67 | Christoph Hellwig | if (aiocb->aio_type & QEMU_AIO_WRITE)
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218 | f141eafe | aliguori | len = pwrite(aiocb->aio_fildes, |
219 | f141eafe | aliguori | (const char *)buf + offset, |
220 | f141eafe | aliguori | aiocb->aio_nbytes - offset, |
221 | f141eafe | aliguori | aiocb->aio_offset + offset); |
222 | f141eafe | aliguori | else
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223 | f141eafe | aliguori | len = pread(aiocb->aio_fildes, |
224 | f141eafe | aliguori | buf + offset, |
225 | 221f715d | aliguori | aiocb->aio_nbytes - offset, |
226 | 221f715d | aliguori | aiocb->aio_offset + offset); |
227 | 221f715d | aliguori | |
228 | f141eafe | aliguori | if (len == -1 && errno == EINTR) |
229 | f141eafe | aliguori | continue;
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230 | f141eafe | aliguori | else if (len == -1) { |
231 | f141eafe | aliguori | offset = -errno; |
232 | f141eafe | aliguori | break;
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233 | f141eafe | aliguori | } else if (len == 0) |
234 | f141eafe | aliguori | break;
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235 | f141eafe | aliguori | |
236 | f141eafe | aliguori | offset += len; |
237 | 221f715d | aliguori | } |
238 | 221f715d | aliguori | |
239 | 221f715d | aliguori | return offset;
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240 | 221f715d | aliguori | } |
241 | 221f715d | aliguori | |
242 | 6769da29 | Kevin Wolf | static ssize_t handle_aiocb_rw(struct qemu_paiocb *aiocb) |
243 | 221f715d | aliguori | { |
244 | 6769da29 | Kevin Wolf | ssize_t nbytes; |
245 | f141eafe | aliguori | char *buf;
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246 | f141eafe | aliguori | |
247 | 9ef91a67 | Christoph Hellwig | if (!(aiocb->aio_type & QEMU_AIO_MISALIGNED)) {
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248 | f141eafe | aliguori | /*
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249 | f141eafe | aliguori | * If there is just a single buffer, and it is properly aligned
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250 | f141eafe | aliguori | * we can just use plain pread/pwrite without any problems.
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251 | f141eafe | aliguori | */
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252 | ceb42de8 | aliguori | if (aiocb->aio_niov == 1) |
253 | ceb42de8 | aliguori | return handle_aiocb_rw_linear(aiocb, aiocb->aio_iov->iov_base);
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254 | ceb42de8 | aliguori | |
255 | ceb42de8 | aliguori | /*
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256 | ceb42de8 | aliguori | * We have more than one iovec, and all are properly aligned.
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257 | ceb42de8 | aliguori | *
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258 | ceb42de8 | aliguori | * Try preadv/pwritev first and fall back to linearizing the
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259 | ceb42de8 | aliguori | * buffer if it's not supported.
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260 | ceb42de8 | aliguori | */
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261 | b587a52c | Stefan Hajnoczi | if (preadv_present) {
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262 | ceb42de8 | aliguori | nbytes = handle_aiocb_rw_vector(aiocb); |
263 | ceb42de8 | aliguori | if (nbytes == aiocb->aio_nbytes)
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264 | b587a52c | Stefan Hajnoczi | return nbytes;
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265 | ceb42de8 | aliguori | if (nbytes < 0 && nbytes != -ENOSYS) |
266 | ceb42de8 | aliguori | return nbytes;
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267 | ceb42de8 | aliguori | preadv_present = 0;
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268 | ceb42de8 | aliguori | } |
269 | ceb42de8 | aliguori | |
270 | ceb42de8 | aliguori | /*
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271 | ceb42de8 | aliguori | * XXX(hch): short read/write. no easy way to handle the reminder
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272 | ceb42de8 | aliguori | * using these interfaces. For now retry using plain
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273 | ceb42de8 | aliguori | * pread/pwrite?
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274 | ceb42de8 | aliguori | */
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275 | f141eafe | aliguori | } |
276 | 221f715d | aliguori | |
277 | f141eafe | aliguori | /*
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278 | f141eafe | aliguori | * Ok, we have to do it the hard way, copy all segments into
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279 | f141eafe | aliguori | * a single aligned buffer.
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280 | f141eafe | aliguori | */
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281 | 72aef731 | Christoph Hellwig | buf = qemu_blockalign(aiocb->common.bs, aiocb->aio_nbytes); |
282 | 9ef91a67 | Christoph Hellwig | if (aiocb->aio_type & QEMU_AIO_WRITE) {
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283 | f141eafe | aliguori | char *p = buf;
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284 | f141eafe | aliguori | int i;
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285 | f141eafe | aliguori | |
286 | f141eafe | aliguori | for (i = 0; i < aiocb->aio_niov; ++i) { |
287 | f141eafe | aliguori | memcpy(p, aiocb->aio_iov[i].iov_base, aiocb->aio_iov[i].iov_len); |
288 | f141eafe | aliguori | p += aiocb->aio_iov[i].iov_len; |
289 | f141eafe | aliguori | } |
290 | f141eafe | aliguori | } |
291 | f141eafe | aliguori | |
292 | f141eafe | aliguori | nbytes = handle_aiocb_rw_linear(aiocb, buf); |
293 | 9ef91a67 | Christoph Hellwig | if (!(aiocb->aio_type & QEMU_AIO_WRITE)) {
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294 | f141eafe | aliguori | char *p = buf;
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295 | f141eafe | aliguori | size_t count = aiocb->aio_nbytes, copy; |
296 | f141eafe | aliguori | int i;
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297 | f141eafe | aliguori | |
298 | f141eafe | aliguori | for (i = 0; i < aiocb->aio_niov && count; ++i) { |
299 | f141eafe | aliguori | copy = count; |
300 | f141eafe | aliguori | if (copy > aiocb->aio_iov[i].iov_len)
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301 | f141eafe | aliguori | copy = aiocb->aio_iov[i].iov_len; |
302 | f141eafe | aliguori | memcpy(aiocb->aio_iov[i].iov_base, p, copy); |
303 | f141eafe | aliguori | p += copy; |
304 | f141eafe | aliguori | count -= copy; |
305 | f141eafe | aliguori | } |
306 | f141eafe | aliguori | } |
307 | f141eafe | aliguori | qemu_vfree(buf); |
308 | f141eafe | aliguori | |
309 | f141eafe | aliguori | return nbytes;
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310 | 221f715d | aliguori | } |
311 | 221f715d | aliguori | |
312 | e1d3b254 | Frediano Ziglio | static void posix_aio_notify_event(void); |
313 | e1d3b254 | Frediano Ziglio | |
314 | 3c529d93 | aliguori | static void *aio_thread(void *unused) |
315 | 3c529d93 | aliguori | { |
316 | e4ea78ee | Avi Kivity | mutex_lock(&lock); |
317 | e4ea78ee | Avi Kivity | pending_threads--; |
318 | e4ea78ee | Avi Kivity | mutex_unlock(&lock); |
319 | e4ea78ee | Avi Kivity | do_spawn_thread(); |
320 | e4ea78ee | Avi Kivity | |
321 | 3c529d93 | aliguori | while (1) { |
322 | 3c529d93 | aliguori | struct qemu_paiocb *aiocb;
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323 | 6769da29 | Kevin Wolf | ssize_t ret = 0;
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324 | 30525aff | malc | qemu_timeval tv; |
325 | 30525aff | malc | struct timespec ts;
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326 | 30525aff | malc | |
327 | 30525aff | malc | qemu_gettimeofday(&tv); |
328 | 30525aff | malc | ts.tv_sec = tv.tv_sec + 10;
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329 | 30525aff | malc | ts.tv_nsec = 0;
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330 | 3c529d93 | aliguori | |
331 | 8653c015 | malc | mutex_lock(&lock); |
332 | 3c529d93 | aliguori | |
333 | 72cf2d4f | Blue Swirl | while (QTAILQ_EMPTY(&request_list) &&
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334 | 3c529d93 | aliguori | !(ret == ETIMEDOUT)) { |
335 | 5be4aab7 | Kevin Wolf | idle_threads++; |
336 | 8653c015 | malc | ret = cond_timedwait(&cond, &lock, &ts); |
337 | 5be4aab7 | Kevin Wolf | idle_threads--; |
338 | 3c529d93 | aliguori | } |
339 | 3c529d93 | aliguori | |
340 | 72cf2d4f | Blue Swirl | if (QTAILQ_EMPTY(&request_list))
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341 | 3c529d93 | aliguori | break;
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342 | 3c529d93 | aliguori | |
343 | 72cf2d4f | Blue Swirl | aiocb = QTAILQ_FIRST(&request_list); |
344 | 72cf2d4f | Blue Swirl | QTAILQ_REMOVE(&request_list, aiocb, node); |
345 | 3c529d93 | aliguori | aiocb->active = 1;
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346 | 8653c015 | malc | mutex_unlock(&lock); |
347 | 3c529d93 | aliguori | |
348 | 9ef91a67 | Christoph Hellwig | switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
|
349 | 9ef91a67 | Christoph Hellwig | case QEMU_AIO_READ:
|
350 | ba1d1afd | Kevin Wolf | ret = handle_aiocb_rw(aiocb); |
351 | ba1d1afd | Kevin Wolf | if (ret >= 0 && ret < aiocb->aio_nbytes && aiocb->common.bs->growable) { |
352 | ba1d1afd | Kevin Wolf | /* A short read means that we have reached EOF. Pad the buffer
|
353 | ba1d1afd | Kevin Wolf | * with zeros for bytes after EOF. */
|
354 | ba1d1afd | Kevin Wolf | QEMUIOVector qiov; |
355 | ba1d1afd | Kevin Wolf | |
356 | ba1d1afd | Kevin Wolf | qemu_iovec_init_external(&qiov, aiocb->aio_iov, |
357 | ba1d1afd | Kevin Wolf | aiocb->aio_niov); |
358 | ba1d1afd | Kevin Wolf | qemu_iovec_memset_skip(&qiov, 0, aiocb->aio_nbytes - ret, ret);
|
359 | ba1d1afd | Kevin Wolf | |
360 | ba1d1afd | Kevin Wolf | ret = aiocb->aio_nbytes; |
361 | ba1d1afd | Kevin Wolf | } |
362 | ba1d1afd | Kevin Wolf | break;
|
363 | 9ef91a67 | Christoph Hellwig | case QEMU_AIO_WRITE:
|
364 | b587a52c | Stefan Hajnoczi | ret = handle_aiocb_rw(aiocb); |
365 | b587a52c | Stefan Hajnoczi | break;
|
366 | b2e12bc6 | Christoph Hellwig | case QEMU_AIO_FLUSH:
|
367 | b587a52c | Stefan Hajnoczi | ret = handle_aiocb_flush(aiocb); |
368 | b587a52c | Stefan Hajnoczi | break;
|
369 | 9ef91a67 | Christoph Hellwig | case QEMU_AIO_IOCTL:
|
370 | b587a52c | Stefan Hajnoczi | ret = handle_aiocb_ioctl(aiocb); |
371 | b587a52c | Stefan Hajnoczi | break;
|
372 | b587a52c | Stefan Hajnoczi | default:
|
373 | b587a52c | Stefan Hajnoczi | fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
|
374 | b587a52c | Stefan Hajnoczi | ret = -EINVAL; |
375 | b587a52c | Stefan Hajnoczi | break;
|
376 | b587a52c | Stefan Hajnoczi | } |
377 | 3c529d93 | aliguori | |
378 | 8653c015 | malc | mutex_lock(&lock); |
379 | 221f715d | aliguori | aiocb->ret = ret; |
380 | 8653c015 | malc | mutex_unlock(&lock); |
381 | 3c529d93 | aliguori | |
382 | e1d3b254 | Frediano Ziglio | posix_aio_notify_event(); |
383 | 3c529d93 | aliguori | } |
384 | 3c529d93 | aliguori | |
385 | 3c529d93 | aliguori | cur_threads--; |
386 | 8653c015 | malc | mutex_unlock(&lock); |
387 | 3c529d93 | aliguori | |
388 | 3c529d93 | aliguori | return NULL; |
389 | 3c529d93 | aliguori | } |
390 | 3c529d93 | aliguori | |
391 | e4ea78ee | Avi Kivity | static void do_spawn_thread(void) |
392 | 3c529d93 | aliguori | { |
393 | ee399306 | malc | sigset_t set, oldset; |
394 | ee399306 | malc | |
395 | e4ea78ee | Avi Kivity | mutex_lock(&lock); |
396 | e4ea78ee | Avi Kivity | if (!new_threads) {
|
397 | e4ea78ee | Avi Kivity | mutex_unlock(&lock); |
398 | e4ea78ee | Avi Kivity | return;
|
399 | e4ea78ee | Avi Kivity | } |
400 | e4ea78ee | Avi Kivity | |
401 | e4ea78ee | Avi Kivity | new_threads--; |
402 | e4ea78ee | Avi Kivity | pending_threads++; |
403 | e4ea78ee | Avi Kivity | |
404 | e4ea78ee | Avi Kivity | mutex_unlock(&lock); |
405 | ee399306 | malc | |
406 | ee399306 | malc | /* block all signals */
|
407 | ee399306 | malc | if (sigfillset(&set)) die("sigfillset"); |
408 | ee399306 | malc | if (sigprocmask(SIG_SETMASK, &set, &oldset)) die("sigprocmask"); |
409 | ee399306 | malc | |
410 | 8653c015 | malc | thread_create(&thread_id, &attr, aio_thread, NULL);
|
411 | ee399306 | malc | |
412 | ee399306 | malc | if (sigprocmask(SIG_SETMASK, &oldset, NULL)) die("sigprocmask restore"); |
413 | 3c529d93 | aliguori | } |
414 | 3c529d93 | aliguori | |
415 | e4ea78ee | Avi Kivity | static void spawn_thread_bh_fn(void *opaque) |
416 | e4ea78ee | Avi Kivity | { |
417 | e4ea78ee | Avi Kivity | do_spawn_thread(); |
418 | e4ea78ee | Avi Kivity | } |
419 | e4ea78ee | Avi Kivity | |
420 | e4ea78ee | Avi Kivity | static void spawn_thread(void) |
421 | e4ea78ee | Avi Kivity | { |
422 | e4ea78ee | Avi Kivity | cur_threads++; |
423 | e4ea78ee | Avi Kivity | new_threads++; |
424 | e4ea78ee | Avi Kivity | /* If there are threads being created, they will spawn new workers, so
|
425 | e4ea78ee | Avi Kivity | * we don't spend time creating many threads in a loop holding a mutex or
|
426 | e4ea78ee | Avi Kivity | * starving the current vcpu.
|
427 | e4ea78ee | Avi Kivity | *
|
428 | e4ea78ee | Avi Kivity | * If there are no idle threads, ask the main thread to create one, so we
|
429 | e4ea78ee | Avi Kivity | * inherit the correct affinity instead of the vcpu affinity.
|
430 | e4ea78ee | Avi Kivity | */
|
431 | e4ea78ee | Avi Kivity | if (!pending_threads) {
|
432 | e4ea78ee | Avi Kivity | qemu_bh_schedule(new_thread_bh); |
433 | e4ea78ee | Avi Kivity | } |
434 | e4ea78ee | Avi Kivity | } |
435 | e4ea78ee | Avi Kivity | |
436 | 9ef91a67 | Christoph Hellwig | static void qemu_paio_submit(struct qemu_paiocb *aiocb) |
437 | 3c529d93 | aliguori | { |
438 | 3c529d93 | aliguori | aiocb->ret = -EINPROGRESS; |
439 | 3c529d93 | aliguori | aiocb->active = 0;
|
440 | 8653c015 | malc | mutex_lock(&lock); |
441 | 3c529d93 | aliguori | if (idle_threads == 0 && cur_threads < max_threads) |
442 | 3c529d93 | aliguori | spawn_thread(); |
443 | 72cf2d4f | Blue Swirl | QTAILQ_INSERT_TAIL(&request_list, aiocb, node); |
444 | 8653c015 | malc | mutex_unlock(&lock); |
445 | 5d47e372 | malc | cond_signal(&cond); |
446 | 3c529d93 | aliguori | } |
447 | 3c529d93 | aliguori | |
448 | 9ef91a67 | Christoph Hellwig | static ssize_t qemu_paio_return(struct qemu_paiocb *aiocb) |
449 | 3c529d93 | aliguori | { |
450 | 3c529d93 | aliguori | ssize_t ret; |
451 | 3c529d93 | aliguori | |
452 | 8653c015 | malc | mutex_lock(&lock); |
453 | 3c529d93 | aliguori | ret = aiocb->ret; |
454 | 8653c015 | malc | mutex_unlock(&lock); |
455 | 3c529d93 | aliguori | |
456 | 3c529d93 | aliguori | return ret;
|
457 | 3c529d93 | aliguori | } |
458 | 3c529d93 | aliguori | |
459 | 9ef91a67 | Christoph Hellwig | static int qemu_paio_error(struct qemu_paiocb *aiocb) |
460 | 3c529d93 | aliguori | { |
461 | 3c529d93 | aliguori | ssize_t ret = qemu_paio_return(aiocb); |
462 | 3c529d93 | aliguori | |
463 | 3c529d93 | aliguori | if (ret < 0) |
464 | 3c529d93 | aliguori | ret = -ret; |
465 | 3c529d93 | aliguori | else
|
466 | 3c529d93 | aliguori | ret = 0;
|
467 | 3c529d93 | aliguori | |
468 | 3c529d93 | aliguori | return ret;
|
469 | 3c529d93 | aliguori | } |
470 | 3c529d93 | aliguori | |
471 | 59c7b155 | Kevin Wolf | static int posix_aio_process_queue(void *opaque) |
472 | 3c529d93 | aliguori | { |
473 | 9ef91a67 | Christoph Hellwig | PosixAioState *s = opaque; |
474 | 9ef91a67 | Christoph Hellwig | struct qemu_paiocb *acb, **pacb;
|
475 | 3c529d93 | aliguori | int ret;
|
476 | 59c7b155 | Kevin Wolf | int result = 0; |
477 | 9ef91a67 | Christoph Hellwig | |
478 | 9ef91a67 | Christoph Hellwig | for(;;) {
|
479 | 9ef91a67 | Christoph Hellwig | pacb = &s->first_aio; |
480 | 9ef91a67 | Christoph Hellwig | for(;;) {
|
481 | 9ef91a67 | Christoph Hellwig | acb = *pacb; |
482 | 9ef91a67 | Christoph Hellwig | if (!acb)
|
483 | 59c7b155 | Kevin Wolf | return result;
|
484 | e5f37649 | Kevin Wolf | |
485 | 9ef91a67 | Christoph Hellwig | ret = qemu_paio_error(acb); |
486 | 9ef91a67 | Christoph Hellwig | if (ret == ECANCELED) {
|
487 | 9ef91a67 | Christoph Hellwig | /* remove the request */
|
488 | 9ef91a67 | Christoph Hellwig | *pacb = acb->next; |
489 | 9ef91a67 | Christoph Hellwig | qemu_aio_release(acb); |
490 | 59c7b155 | Kevin Wolf | result = 1;
|
491 | 9ef91a67 | Christoph Hellwig | } else if (ret != EINPROGRESS) { |
492 | 9ef91a67 | Christoph Hellwig | /* end of aio */
|
493 | 9ef91a67 | Christoph Hellwig | if (ret == 0) { |
494 | 9ef91a67 | Christoph Hellwig | ret = qemu_paio_return(acb); |
495 | 9ef91a67 | Christoph Hellwig | if (ret == acb->aio_nbytes)
|
496 | 9ef91a67 | Christoph Hellwig | ret = 0;
|
497 | 9ef91a67 | Christoph Hellwig | else
|
498 | 9ef91a67 | Christoph Hellwig | ret = -EINVAL; |
499 | 9ef91a67 | Christoph Hellwig | } else {
|
500 | 9ef91a67 | Christoph Hellwig | ret = -ret; |
501 | 9ef91a67 | Christoph Hellwig | } |
502 | ddca9fb2 | Stefan Hajnoczi | |
503 | ddca9fb2 | Stefan Hajnoczi | trace_paio_complete(acb, acb->common.opaque, ret); |
504 | ddca9fb2 | Stefan Hajnoczi | |
505 | 9ef91a67 | Christoph Hellwig | /* remove the request */
|
506 | 9ef91a67 | Christoph Hellwig | *pacb = acb->next; |
507 | 9ef91a67 | Christoph Hellwig | /* call the callback */
|
508 | 9ef91a67 | Christoph Hellwig | acb->common.cb(acb->common.opaque, ret); |
509 | 9ef91a67 | Christoph Hellwig | qemu_aio_release(acb); |
510 | 59c7b155 | Kevin Wolf | result = 1;
|
511 | 9ef91a67 | Christoph Hellwig | break;
|
512 | 9ef91a67 | Christoph Hellwig | } else {
|
513 | 9ef91a67 | Christoph Hellwig | pacb = &acb->next; |
514 | 9ef91a67 | Christoph Hellwig | } |
515 | 9ef91a67 | Christoph Hellwig | } |
516 | 9ef91a67 | Christoph Hellwig | } |
517 | 59c7b155 | Kevin Wolf | |
518 | 59c7b155 | Kevin Wolf | return result;
|
519 | 59c7b155 | Kevin Wolf | } |
520 | 59c7b155 | Kevin Wolf | |
521 | 59c7b155 | Kevin Wolf | static void posix_aio_read(void *opaque) |
522 | 59c7b155 | Kevin Wolf | { |
523 | 59c7b155 | Kevin Wolf | PosixAioState *s = opaque; |
524 | 59c7b155 | Kevin Wolf | ssize_t len; |
525 | 59c7b155 | Kevin Wolf | |
526 | 59c7b155 | Kevin Wolf | /* read all bytes from signal pipe */
|
527 | 59c7b155 | Kevin Wolf | for (;;) {
|
528 | 59c7b155 | Kevin Wolf | char bytes[16]; |
529 | 59c7b155 | Kevin Wolf | |
530 | 59c7b155 | Kevin Wolf | len = read(s->rfd, bytes, sizeof(bytes));
|
531 | 59c7b155 | Kevin Wolf | if (len == -1 && errno == EINTR) |
532 | 59c7b155 | Kevin Wolf | continue; /* try again */ |
533 | 59c7b155 | Kevin Wolf | if (len == sizeof(bytes)) |
534 | 59c7b155 | Kevin Wolf | continue; /* more to read */ |
535 | 59c7b155 | Kevin Wolf | break;
|
536 | 59c7b155 | Kevin Wolf | } |
537 | 59c7b155 | Kevin Wolf | |
538 | 59c7b155 | Kevin Wolf | posix_aio_process_queue(s); |
539 | 9ef91a67 | Christoph Hellwig | } |
540 | 9ef91a67 | Christoph Hellwig | |
541 | 9ef91a67 | Christoph Hellwig | static int posix_aio_flush(void *opaque) |
542 | 9ef91a67 | Christoph Hellwig | { |
543 | 9ef91a67 | Christoph Hellwig | PosixAioState *s = opaque; |
544 | 9ef91a67 | Christoph Hellwig | return !!s->first_aio;
|
545 | 9ef91a67 | Christoph Hellwig | } |
546 | 9ef91a67 | Christoph Hellwig | |
547 | 9ef91a67 | Christoph Hellwig | static PosixAioState *posix_aio_state;
|
548 | 9ef91a67 | Christoph Hellwig | |
549 | e1d3b254 | Frediano Ziglio | static void posix_aio_notify_event(void) |
550 | 9ef91a67 | Christoph Hellwig | { |
551 | e1d3b254 | Frediano Ziglio | char byte = 0; |
552 | e1d3b254 | Frediano Ziglio | ssize_t ret; |
553 | 9ef91a67 | Christoph Hellwig | |
554 | e1d3b254 | Frediano Ziglio | ret = write(posix_aio_state->wfd, &byte, sizeof(byte));
|
555 | e1d3b254 | Frediano Ziglio | if (ret < 0 && errno != EAGAIN) |
556 | e1d3b254 | Frediano Ziglio | die("write()");
|
557 | 9ef91a67 | Christoph Hellwig | } |
558 | 9ef91a67 | Christoph Hellwig | |
559 | 9ef91a67 | Christoph Hellwig | static void paio_remove(struct qemu_paiocb *acb) |
560 | 9ef91a67 | Christoph Hellwig | { |
561 | 9ef91a67 | Christoph Hellwig | struct qemu_paiocb **pacb;
|
562 | 9ef91a67 | Christoph Hellwig | |
563 | 9ef91a67 | Christoph Hellwig | /* remove the callback from the queue */
|
564 | 9ef91a67 | Christoph Hellwig | pacb = &posix_aio_state->first_aio; |
565 | 9ef91a67 | Christoph Hellwig | for(;;) {
|
566 | 9ef91a67 | Christoph Hellwig | if (*pacb == NULL) { |
567 | 9ef91a67 | Christoph Hellwig | fprintf(stderr, "paio_remove: aio request not found!\n");
|
568 | 9ef91a67 | Christoph Hellwig | break;
|
569 | 9ef91a67 | Christoph Hellwig | } else if (*pacb == acb) { |
570 | 9ef91a67 | Christoph Hellwig | *pacb = acb->next; |
571 | 9ef91a67 | Christoph Hellwig | qemu_aio_release(acb); |
572 | 9ef91a67 | Christoph Hellwig | break;
|
573 | 9ef91a67 | Christoph Hellwig | } |
574 | 9ef91a67 | Christoph Hellwig | pacb = &(*pacb)->next; |
575 | 9ef91a67 | Christoph Hellwig | } |
576 | 9ef91a67 | Christoph Hellwig | } |
577 | 9ef91a67 | Christoph Hellwig | |
578 | 9ef91a67 | Christoph Hellwig | static void paio_cancel(BlockDriverAIOCB *blockacb) |
579 | 9ef91a67 | Christoph Hellwig | { |
580 | 9ef91a67 | Christoph Hellwig | struct qemu_paiocb *acb = (struct qemu_paiocb *)blockacb; |
581 | 9ef91a67 | Christoph Hellwig | int active = 0; |
582 | 3c529d93 | aliguori | |
583 | ddca9fb2 | Stefan Hajnoczi | trace_paio_cancel(acb, acb->common.opaque); |
584 | ddca9fb2 | Stefan Hajnoczi | |
585 | 8653c015 | malc | mutex_lock(&lock); |
586 | 9ef91a67 | Christoph Hellwig | if (!acb->active) {
|
587 | 72cf2d4f | Blue Swirl | QTAILQ_REMOVE(&request_list, acb, node); |
588 | 9ef91a67 | Christoph Hellwig | acb->ret = -ECANCELED; |
589 | 9ef91a67 | Christoph Hellwig | } else if (acb->ret == -EINPROGRESS) { |
590 | 9ef91a67 | Christoph Hellwig | active = 1;
|
591 | 9ef91a67 | Christoph Hellwig | } |
592 | 8653c015 | malc | mutex_unlock(&lock); |
593 | 3c529d93 | aliguori | |
594 | 9ef91a67 | Christoph Hellwig | if (active) {
|
595 | 9ef91a67 | Christoph Hellwig | /* fail safe: if the aio could not be canceled, we wait for
|
596 | 9ef91a67 | Christoph Hellwig | it */
|
597 | 9ef91a67 | Christoph Hellwig | while (qemu_paio_error(acb) == EINPROGRESS)
|
598 | 9ef91a67 | Christoph Hellwig | ; |
599 | 9ef91a67 | Christoph Hellwig | } |
600 | 9ef91a67 | Christoph Hellwig | |
601 | 9ef91a67 | Christoph Hellwig | paio_remove(acb); |
602 | 9ef91a67 | Christoph Hellwig | } |
603 | 9ef91a67 | Christoph Hellwig | |
604 | 9ef91a67 | Christoph Hellwig | static AIOPool raw_aio_pool = {
|
605 | 9ef91a67 | Christoph Hellwig | .aiocb_size = sizeof(struct qemu_paiocb), |
606 | 9ef91a67 | Christoph Hellwig | .cancel = paio_cancel, |
607 | 9ef91a67 | Christoph Hellwig | }; |
608 | 9ef91a67 | Christoph Hellwig | |
609 | 1e5b9d2f | Kevin Wolf | BlockDriverAIOCB *paio_submit(BlockDriverState *bs, int fd,
|
610 | 9ef91a67 | Christoph Hellwig | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
611 | 9ef91a67 | Christoph Hellwig | BlockDriverCompletionFunc *cb, void *opaque, int type) |
612 | 9ef91a67 | Christoph Hellwig | { |
613 | 9ef91a67 | Christoph Hellwig | struct qemu_paiocb *acb;
|
614 | 9ef91a67 | Christoph Hellwig | |
615 | 9ef91a67 | Christoph Hellwig | acb = qemu_aio_get(&raw_aio_pool, bs, cb, opaque); |
616 | 9ef91a67 | Christoph Hellwig | acb->aio_type = type; |
617 | 9ef91a67 | Christoph Hellwig | acb->aio_fildes = fd; |
618 | e5f37649 | Kevin Wolf | |
619 | b2e12bc6 | Christoph Hellwig | if (qiov) {
|
620 | b2e12bc6 | Christoph Hellwig | acb->aio_iov = qiov->iov; |
621 | b2e12bc6 | Christoph Hellwig | acb->aio_niov = qiov->niov; |
622 | b2e12bc6 | Christoph Hellwig | } |
623 | 9ef91a67 | Christoph Hellwig | acb->aio_nbytes = nb_sectors * 512;
|
624 | 9ef91a67 | Christoph Hellwig | acb->aio_offset = sector_num * 512;
|
625 | 9ef91a67 | Christoph Hellwig | |
626 | 9ef91a67 | Christoph Hellwig | acb->next = posix_aio_state->first_aio; |
627 | 9ef91a67 | Christoph Hellwig | posix_aio_state->first_aio = acb; |
628 | 9ef91a67 | Christoph Hellwig | |
629 | 6d519a5f | Stefan Hajnoczi | trace_paio_submit(acb, opaque, sector_num, nb_sectors, type); |
630 | 9ef91a67 | Christoph Hellwig | qemu_paio_submit(acb); |
631 | 9ef91a67 | Christoph Hellwig | return &acb->common;
|
632 | 9ef91a67 | Christoph Hellwig | } |
633 | 9ef91a67 | Christoph Hellwig | |
634 | 9ef91a67 | Christoph Hellwig | BlockDriverAIOCB *paio_ioctl(BlockDriverState *bs, int fd,
|
635 | 9ef91a67 | Christoph Hellwig | unsigned long int req, void *buf, |
636 | 9ef91a67 | Christoph Hellwig | BlockDriverCompletionFunc *cb, void *opaque)
|
637 | 9ef91a67 | Christoph Hellwig | { |
638 | 9ef91a67 | Christoph Hellwig | struct qemu_paiocb *acb;
|
639 | 9ef91a67 | Christoph Hellwig | |
640 | 9ef91a67 | Christoph Hellwig | acb = qemu_aio_get(&raw_aio_pool, bs, cb, opaque); |
641 | 9ef91a67 | Christoph Hellwig | acb->aio_type = QEMU_AIO_IOCTL; |
642 | 9ef91a67 | Christoph Hellwig | acb->aio_fildes = fd; |
643 | 9ef91a67 | Christoph Hellwig | acb->aio_offset = 0;
|
644 | 9ef91a67 | Christoph Hellwig | acb->aio_ioctl_buf = buf; |
645 | 9ef91a67 | Christoph Hellwig | acb->aio_ioctl_cmd = req; |
646 | 9ef91a67 | Christoph Hellwig | |
647 | 9ef91a67 | Christoph Hellwig | acb->next = posix_aio_state->first_aio; |
648 | 9ef91a67 | Christoph Hellwig | posix_aio_state->first_aio = acb; |
649 | 9ef91a67 | Christoph Hellwig | |
650 | 9ef91a67 | Christoph Hellwig | qemu_paio_submit(acb); |
651 | 9ef91a67 | Christoph Hellwig | return &acb->common;
|
652 | 9ef91a67 | Christoph Hellwig | } |
653 | 9ef91a67 | Christoph Hellwig | |
654 | 1e5b9d2f | Kevin Wolf | int paio_init(void) |
655 | 9ef91a67 | Christoph Hellwig | { |
656 | 9ef91a67 | Christoph Hellwig | PosixAioState *s; |
657 | 9ef91a67 | Christoph Hellwig | int fds[2]; |
658 | 9ef91a67 | Christoph Hellwig | int ret;
|
659 | 9ef91a67 | Christoph Hellwig | |
660 | 9ef91a67 | Christoph Hellwig | if (posix_aio_state)
|
661 | 1e5b9d2f | Kevin Wolf | return 0; |
662 | 9ef91a67 | Christoph Hellwig | |
663 | 7267c094 | Anthony Liguori | s = g_malloc(sizeof(PosixAioState));
|
664 | 9ef91a67 | Christoph Hellwig | |
665 | 9ef91a67 | Christoph Hellwig | s->first_aio = NULL;
|
666 | 40ff6d7e | Kevin Wolf | if (qemu_pipe(fds) == -1) { |
667 | 9ef91a67 | Christoph Hellwig | fprintf(stderr, "failed to create pipe\n");
|
668 | 095ed5be | Markus Armbruster | g_free(s); |
669 | 1e5b9d2f | Kevin Wolf | return -1; |
670 | 9ef91a67 | Christoph Hellwig | } |
671 | 9ef91a67 | Christoph Hellwig | |
672 | 9ef91a67 | Christoph Hellwig | s->rfd = fds[0];
|
673 | 9ef91a67 | Christoph Hellwig | s->wfd = fds[1];
|
674 | 9ef91a67 | Christoph Hellwig | |
675 | 9ef91a67 | Christoph Hellwig | fcntl(s->rfd, F_SETFL, O_NONBLOCK); |
676 | 9ef91a67 | Christoph Hellwig | fcntl(s->wfd, F_SETFL, O_NONBLOCK); |
677 | 9ef91a67 | Christoph Hellwig | |
678 | 8febfa26 | Kevin Wolf | qemu_aio_set_fd_handler(s->rfd, posix_aio_read, NULL, posix_aio_flush,
|
679 | 8febfa26 | Kevin Wolf | posix_aio_process_queue, s); |
680 | 9ef91a67 | Christoph Hellwig | |
681 | 9ef91a67 | Christoph Hellwig | ret = pthread_attr_init(&attr); |
682 | 9ef91a67 | Christoph Hellwig | if (ret)
|
683 | 9ef91a67 | Christoph Hellwig | die2(ret, "pthread_attr_init");
|
684 | 9ef91a67 | Christoph Hellwig | |
685 | 9ef91a67 | Christoph Hellwig | ret = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED); |
686 | 9ef91a67 | Christoph Hellwig | if (ret)
|
687 | 9ef91a67 | Christoph Hellwig | die2(ret, "pthread_attr_setdetachstate");
|
688 | 9ef91a67 | Christoph Hellwig | |
689 | 72cf2d4f | Blue Swirl | QTAILQ_INIT(&request_list); |
690 | e4ea78ee | Avi Kivity | new_thread_bh = qemu_bh_new(spawn_thread_bh_fn, NULL);
|
691 | 9ef91a67 | Christoph Hellwig | |
692 | 9ef91a67 | Christoph Hellwig | posix_aio_state = s; |
693 | 1e5b9d2f | Kevin Wolf | return 0; |
694 | 3c529d93 | aliguori | } |