Mercurial > hg > nginx
annotate src/os/unix/ngx_linux_aio_read.c @ 4412:d620f497c50f
Copyright updated.
| author | Maxim Konovalov <maxim@nginx.com> |
|---|---|
| date | Wed, 18 Jan 2012 15:07:43 +0000 |
| parents | 6903dac6ad19 |
| children | ccad84a174e0 |
| rev | line source |
|---|---|
| 3052 | 1 |
| 2 /* | |
| 3 * Copyright (C) Igor Sysoev | |
| 4412 | 4 * Copyright (C) Nginx, Inc. |
| 3052 | 5 */ |
| 6 | |
| 7 | |
| 8 #include <ngx_config.h> | |
| 9 #include <ngx_core.h> | |
| 10 #include <ngx_event.h> | |
| 11 | |
| 12 | |
| 13 extern int ngx_eventfd; | |
| 14 extern aio_context_t ngx_aio_ctx; | |
| 15 | |
| 16 | |
| 17 static void ngx_file_aio_event_handler(ngx_event_t *ev); | |
| 18 | |
| 19 | |
|
4129
6903dac6ad19
Fixing Linux AIO syscalls return value handling:
Igor Sysoev <igor@sysoev.ru>
parents:
4076
diff
changeset
|
20 static int |
| 3052 | 21 io_submit(aio_context_t ctx, long n, struct iocb **paiocb) |
| 22 { | |
| 23 return syscall(SYS_io_submit, ctx, n, paiocb); | |
| 24 } | |
| 25 | |
| 26 | |
| 27 ssize_t | |
| 28 ngx_file_aio_read(ngx_file_t *file, u_char *buf, size_t size, off_t offset, | |
| 29 ngx_pool_t *pool) | |
| 30 { | |
|
4129
6903dac6ad19
Fixing Linux AIO syscalls return value handling:
Igor Sysoev <igor@sysoev.ru>
parents:
4076
diff
changeset
|
31 ngx_err_t err; |
|
3294
04cfc09b8b8d
export aio presence knowledge to prevent using "aio sendfile",
Igor Sysoev <igor@sysoev.ru>
parents:
3052
diff
changeset
|
32 struct iocb *piocb[1]; |
|
04cfc09b8b8d
export aio presence knowledge to prevent using "aio sendfile",
Igor Sysoev <igor@sysoev.ru>
parents:
3052
diff
changeset
|
33 ngx_event_t *ev; |
|
04cfc09b8b8d
export aio presence knowledge to prevent using "aio sendfile",
Igor Sysoev <igor@sysoev.ru>
parents:
3052
diff
changeset
|
34 ngx_event_aio_t *aio; |
| 3052 | 35 |
|
3294
04cfc09b8b8d
export aio presence knowledge to prevent using "aio sendfile",
Igor Sysoev <igor@sysoev.ru>
parents:
3052
diff
changeset
|
36 if (!ngx_file_aio) { |
| 3052 | 37 return ngx_read_file(file, buf, size, offset); |
| 38 } | |
| 39 | |
| 40 aio = file->aio; | |
| 41 | |
| 42 if (aio == NULL) { | |
| 43 aio = ngx_pcalloc(pool, sizeof(ngx_event_aio_t)); | |
| 44 if (aio == NULL) { | |
| 45 return NGX_ERROR; | |
| 46 } | |
| 47 | |
| 48 aio->file = file; | |
| 49 aio->fd = file->fd; | |
| 50 aio->event.data = aio; | |
| 51 aio->event.ready = 1; | |
| 52 aio->event.log = file->log; | |
| 53 file->aio = aio; | |
| 54 } | |
| 55 | |
| 56 ev = &aio->event; | |
| 57 | |
| 58 if (!ev->ready) { | |
| 59 ngx_log_error(NGX_LOG_ALERT, file->log, 0, | |
| 60 "second aio post for \"%V\"", &file->name); | |
| 61 return NGX_AGAIN; | |
| 62 } | |
| 63 | |
| 64 ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0, | |
| 65 "aio complete:%d @%O:%z %V", | |
| 66 ev->complete, offset, size, &file->name); | |
| 67 | |
| 68 if (ev->complete) { | |
| 69 ev->active = 0; | |
| 70 ev->complete = 0; | |
| 71 | |
| 72 if (aio->res >= 0) { | |
| 73 ngx_set_errno(0); | |
| 74 return aio->res; | |
| 75 } | |
| 76 | |
| 77 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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78 |
|
37da005a5808
Bugfix: open_file_cache lost is_directio flag.
Maxim Dounin <mdounin@mdounin.ru>
parents:
3777
diff
changeset
|
79 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
|
80 "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
|
81 |
| 3052 | 82 return NGX_ERROR; |
| 83 } | |
| 84 | |
| 85 ngx_memzero(&aio->aiocb, sizeof(struct iocb)); | |
| 86 | |
| 87 aio->aiocb.aio_data = (uint64_t) (uintptr_t) ev; | |
| 88 aio->aiocb.aio_lio_opcode = IOCB_CMD_PREAD; | |
| 89 aio->aiocb.aio_fildes = file->fd; | |
| 90 aio->aiocb.aio_buf = (uint64_t) (uintptr_t) buf; | |
| 91 aio->aiocb.aio_nbytes = size; | |
| 92 aio->aiocb.aio_offset = offset; | |
| 93 aio->aiocb.aio_flags = IOCB_FLAG_RESFD; | |
| 94 aio->aiocb.aio_resfd = ngx_eventfd; | |
| 95 | |
| 96 ev->handler = ngx_file_aio_event_handler; | |
| 97 | |
| 98 piocb[0] = &aio->aiocb; | |
| 99 | |
|
4129
6903dac6ad19
Fixing Linux AIO syscalls return value handling:
Igor Sysoev <igor@sysoev.ru>
parents:
4076
diff
changeset
|
100 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
|
101 ev->active = 1; |
|
cd04f652478c
update event flags after successful io_submit()
Igor Sysoev <igor@sysoev.ru>
parents:
3294
diff
changeset
|
102 ev->ready = 0; |
|
cd04f652478c
update event flags after successful io_submit()
Igor Sysoev <igor@sysoev.ru>
parents:
3294
diff
changeset
|
103 ev->complete = 0; |
|
cd04f652478c
update event flags after successful io_submit()
Igor Sysoev <igor@sysoev.ru>
parents:
3294
diff
changeset
|
104 |
| 3052 | 105 return NGX_AGAIN; |
| 106 } | |
| 107 | |
|
4129
6903dac6ad19
Fixing Linux AIO syscalls return value handling:
Igor Sysoev <igor@sysoev.ru>
parents:
4076
diff
changeset
|
108 err = ngx_errno; |
| 3052 | 109 |
|
4129
6903dac6ad19
Fixing Linux AIO syscalls return value handling:
Igor Sysoev <igor@sysoev.ru>
parents:
4076
diff
changeset
|
110 if (err == NGX_EAGAIN) { |
| 3052 | 111 return ngx_read_file(file, buf, size, offset); |
| 112 } | |
| 113 | |
|
4129
6903dac6ad19
Fixing Linux AIO syscalls return value handling:
Igor Sysoev <igor@sysoev.ru>
parents:
4076
diff
changeset
|
114 ngx_log_error(NGX_LOG_CRIT, file->log, err, |
| 3052 | 115 "io_submit(\"%V\") failed", &file->name); |
| 116 | |
|
4129
6903dac6ad19
Fixing Linux AIO syscalls return value handling:
Igor Sysoev <igor@sysoev.ru>
parents:
4076
diff
changeset
|
117 if (err == NGX_ENOSYS) { |
|
3294
04cfc09b8b8d
export aio presence knowledge to prevent using "aio sendfile",
Igor Sysoev <igor@sysoev.ru>
parents:
3052
diff
changeset
|
118 ngx_file_aio = 0; |
| 3052 | 119 return ngx_read_file(file, buf, size, offset); |
| 120 } | |
| 121 | |
| 122 return NGX_ERROR; | |
| 123 } | |
| 124 | |
| 125 | |
| 126 static void | |
| 127 ngx_file_aio_event_handler(ngx_event_t *ev) | |
| 128 { | |
| 129 ngx_event_aio_t *aio; | |
| 130 | |
| 131 aio = ev->data; | |
| 132 | |
| 133 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ev->log, 0, | |
| 134 "aio event handler fd:%d %V", aio->fd, &aio->file->name); | |
| 135 | |
| 136 aio->handler(ev); | |
| 137 } |