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annotate src/os/unix/ngx_linux_aio_read.c @ 4320:b72828fe457f
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author | Ruslan Ermilov <ru@nginx.com> |
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date | Wed, 30 Nov 2011 07:36:09 +0000 |
parents | 6903dac6ad19 |
children | d620f497c50f |
rev | line source |
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3052 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4 */ | |
5 | |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 #include <ngx_event.h> | |
10 | |
11 | |
12 extern int ngx_eventfd; | |
13 extern aio_context_t ngx_aio_ctx; | |
14 | |
15 | |
16 static void ngx_file_aio_event_handler(ngx_event_t *ev); | |
17 | |
18 | |
4129
6903dac6ad19
Fixing Linux AIO syscalls return value handling:
Igor Sysoev <igor@sysoev.ru>
parents:
4076
diff
changeset
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19 static int |
3052 | 20 io_submit(aio_context_t ctx, long n, struct iocb **paiocb) |
21 { | |
22 return syscall(SYS_io_submit, ctx, n, paiocb); | |
23 } | |
24 | |
25 | |
26 ssize_t | |
27 ngx_file_aio_read(ngx_file_t *file, u_char *buf, size_t size, off_t offset, | |
28 ngx_pool_t *pool) | |
29 { | |
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Fixing Linux AIO syscalls return value handling:
Igor Sysoev <igor@sysoev.ru>
parents:
4076
diff
changeset
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30 ngx_err_t err; |
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export aio presence knowledge to prevent using "aio sendfile",
Igor Sysoev <igor@sysoev.ru>
parents:
3052
diff
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31 struct iocb *piocb[1]; |
04cfc09b8b8d
export aio presence knowledge to prevent using "aio sendfile",
Igor Sysoev <igor@sysoev.ru>
parents:
3052
diff
changeset
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32 ngx_event_t *ev; |
04cfc09b8b8d
export aio presence knowledge to prevent using "aio sendfile",
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parents:
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33 ngx_event_aio_t *aio; |
3052 | 34 |
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export aio presence knowledge to prevent using "aio sendfile",
Igor Sysoev <igor@sysoev.ru>
parents:
3052
diff
changeset
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35 if (!ngx_file_aio) { |
3052 | 36 return ngx_read_file(file, buf, size, offset); |
37 } | |
38 | |
39 aio = file->aio; | |
40 | |
41 if (aio == NULL) { | |
42 aio = ngx_pcalloc(pool, sizeof(ngx_event_aio_t)); | |
43 if (aio == NULL) { | |
44 return NGX_ERROR; | |
45 } | |
46 | |
47 aio->file = file; | |
48 aio->fd = file->fd; | |
49 aio->event.data = aio; | |
50 aio->event.ready = 1; | |
51 aio->event.log = file->log; | |
52 file->aio = aio; | |
53 } | |
54 | |
55 ev = &aio->event; | |
56 | |
57 if (!ev->ready) { | |
58 ngx_log_error(NGX_LOG_ALERT, file->log, 0, | |
59 "second aio post for \"%V\"", &file->name); | |
60 return NGX_AGAIN; | |
61 } | |
62 | |
63 ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0, | |
64 "aio complete:%d @%O:%z %V", | |
65 ev->complete, offset, size, &file->name); | |
66 | |
67 if (ev->complete) { | |
68 ev->active = 0; | |
69 ev->complete = 0; | |
70 | |
71 if (aio->res >= 0) { | |
72 ngx_set_errno(0); | |
73 return aio->res; | |
74 } | |
75 | |
76 ngx_set_errno(-aio->res); | |
4076
37da005a5808
Bugfix: open_file_cache lost is_directio flag.
Maxim Dounin <mdounin@mdounin.ru>
parents:
3777
diff
changeset
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77 |
37da005a5808
Bugfix: open_file_cache lost is_directio flag.
Maxim Dounin <mdounin@mdounin.ru>
parents:
3777
diff
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78 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, |
37da005a5808
Bugfix: open_file_cache lost is_directio flag.
Maxim Dounin <mdounin@mdounin.ru>
parents:
3777
diff
changeset
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79 "aio read \"%s\" failed", file->name.data); |
37da005a5808
Bugfix: open_file_cache lost is_directio flag.
Maxim Dounin <mdounin@mdounin.ru>
parents:
3777
diff
changeset
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80 |
3052 | 81 return NGX_ERROR; |
82 } | |
83 | |
84 ngx_memzero(&aio->aiocb, sizeof(struct iocb)); | |
85 | |
86 aio->aiocb.aio_data = (uint64_t) (uintptr_t) ev; | |
87 aio->aiocb.aio_lio_opcode = IOCB_CMD_PREAD; | |
88 aio->aiocb.aio_fildes = file->fd; | |
89 aio->aiocb.aio_buf = (uint64_t) (uintptr_t) buf; | |
90 aio->aiocb.aio_nbytes = size; | |
91 aio->aiocb.aio_offset = offset; | |
92 aio->aiocb.aio_flags = IOCB_FLAG_RESFD; | |
93 aio->aiocb.aio_resfd = ngx_eventfd; | |
94 | |
95 ev->handler = ngx_file_aio_event_handler; | |
96 | |
97 piocb[0] = &aio->aiocb; | |
98 | |
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6903dac6ad19
Fixing Linux AIO syscalls return value handling:
Igor Sysoev <igor@sysoev.ru>
parents:
4076
diff
changeset
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99 if (io_submit(ngx_aio_ctx, 1, piocb) == 1) { |
3777
cd04f652478c
update event flags after successful io_submit()
Igor Sysoev <igor@sysoev.ru>
parents:
3294
diff
changeset
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100 ev->active = 1; |
cd04f652478c
update event flags after successful io_submit()
Igor Sysoev <igor@sysoev.ru>
parents:
3294
diff
changeset
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101 ev->ready = 0; |
cd04f652478c
update event flags after successful io_submit()
Igor Sysoev <igor@sysoev.ru>
parents:
3294
diff
changeset
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102 ev->complete = 0; |
cd04f652478c
update event flags after successful io_submit()
Igor Sysoev <igor@sysoev.ru>
parents:
3294
diff
changeset
|
103 |
3052 | 104 return NGX_AGAIN; |
105 } | |
106 | |
4129
6903dac6ad19
Fixing Linux AIO syscalls return value handling:
Igor Sysoev <igor@sysoev.ru>
parents:
4076
diff
changeset
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107 err = ngx_errno; |
3052 | 108 |
4129
6903dac6ad19
Fixing Linux AIO syscalls return value handling:
Igor Sysoev <igor@sysoev.ru>
parents:
4076
diff
changeset
|
109 if (err == NGX_EAGAIN) { |
3052 | 110 return ngx_read_file(file, buf, size, offset); |
111 } | |
112 | |
4129
6903dac6ad19
Fixing Linux AIO syscalls return value handling:
Igor Sysoev <igor@sysoev.ru>
parents:
4076
diff
changeset
|
113 ngx_log_error(NGX_LOG_CRIT, file->log, err, |
3052 | 114 "io_submit(\"%V\") failed", &file->name); |
115 | |
4129
6903dac6ad19
Fixing Linux AIO syscalls return value handling:
Igor Sysoev <igor@sysoev.ru>
parents:
4076
diff
changeset
|
116 if (err == NGX_ENOSYS) { |
3294
04cfc09b8b8d
export aio presence knowledge to prevent using "aio sendfile",
Igor Sysoev <igor@sysoev.ru>
parents:
3052
diff
changeset
|
117 ngx_file_aio = 0; |
3052 | 118 return ngx_read_file(file, buf, size, offset); |
119 } | |
120 | |
121 return NGX_ERROR; | |
122 } | |
123 | |
124 | |
125 static void | |
126 ngx_file_aio_event_handler(ngx_event_t *ev) | |
127 { | |
128 ngx_event_aio_t *aio; | |
129 | |
130 aio = ev->data; | |
131 | |
132 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ev->log, 0, | |
133 "aio event handler fd:%d %V", aio->fd, &aio->file->name); | |
134 | |
135 aio->handler(ev); | |
136 } |