Mercurial > hg > nginx-quic
annotate src/os/unix/ngx_file_aio_read.c @ 7174:84e53e4735a4
Retain CAP_NET_RAW capability for transparent proxying.
The capability is retained automatically in unprivileged worker processes after
changing UID if transparent proxying is enabled at least once in nginx
configuration.
The feature is only available in Linux.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Wed, 13 Dec 2017 20:40:53 +0300 |
parents | f01ab2dbcfdc |
children | 7f035fd1ec7b |
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 /* | |
14 * FreeBSD file AIO features and quirks: | |
15 * | |
16 * if an asked data are already in VM cache, then aio_error() returns 0, | |
17 * and the data are already copied in buffer; | |
18 * | |
3065 | 19 * aio_read() preread in VM cache as minimum 16K (probably BKVASIZE); |
20 * the first AIO preload may be up to 128K; | |
3052 | 21 * |
22 * aio_read/aio_error() may return EINPROGRESS for just written data; | |
23 * | |
24 * kqueue EVFILT_AIO filter is level triggered only: an event repeats | |
25 * until aio_return() will be called; | |
26 * | |
4133
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27 * aio_cancel() cannot cancel file AIO: it returns AIO_NOTCANCELED always. |
3052 | 28 */ |
29 | |
30 | |
31 extern int ngx_kqueue; | |
32 | |
33 | |
34 static ssize_t ngx_file_aio_result(ngx_file_t *file, ngx_event_aio_t *aio, | |
35 ngx_event_t *ev); | |
36 static void ngx_file_aio_event_handler(ngx_event_t *ev); | |
37 | |
38 | |
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39 ngx_int_t |
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40 ngx_file_aio_init(ngx_file_t *file, ngx_pool_t *pool) |
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41 { |
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42 ngx_event_aio_t *aio; |
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43 |
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44 aio = ngx_pcalloc(pool, sizeof(ngx_event_aio_t)); |
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45 if (aio == NULL) { |
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46 return NGX_ERROR; |
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47 } |
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48 |
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49 aio->file = file; |
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50 aio->fd = file->fd; |
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51 aio->event.data = aio; |
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52 aio->event.ready = 1; |
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53 aio->event.log = file->log; |
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54 |
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55 file->aio = aio; |
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56 |
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57 return NGX_OK; |
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58 } |
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59 |
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60 |
3052 | 61 ssize_t |
62 ngx_file_aio_read(ngx_file_t *file, u_char *buf, size_t size, off_t offset, | |
63 ngx_pool_t *pool) | |
64 { | |
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export aio presence knowledge to prevent using "aio sendfile",
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65 int n; |
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66 ngx_event_t *ev; |
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67 ngx_event_aio_t *aio; |
3052 | 68 |
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69 if (!ngx_file_aio) { |
3052 | 70 return ngx_read_file(file, buf, size, offset); |
71 } | |
72 | |
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73 if (file->aio == NULL && ngx_file_aio_init(file, pool) != NGX_OK) { |
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74 return NGX_ERROR; |
3052 | 75 } |
76 | |
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77 aio = file->aio; |
3052 | 78 ev = &aio->event; |
79 | |
80 if (!ev->ready) { | |
81 ngx_log_error(NGX_LOG_ALERT, file->log, 0, | |
82 "second aio post for \"%V\"", &file->name); | |
83 return NGX_AGAIN; | |
84 } | |
85 | |
86 ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0, | |
6480 | 87 "aio complete:%d @%O:%uz %V", |
3052 | 88 ev->complete, offset, size, &file->name); |
89 | |
90 if (ev->complete) { | |
91 ev->complete = 0; | |
92 ngx_set_errno(aio->err); | |
93 | |
94 if (aio->err == 0) { | |
95 return aio->nbytes; | |
96 } | |
97 | |
4076
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Bugfix: open_file_cache lost is_directio flag.
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98 ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno, |
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99 "aio read \"%s\" failed", file->name.data); |
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100 |
3052 | 101 return NGX_ERROR; |
102 } | |
103 | |
104 ngx_memzero(&aio->aiocb, sizeof(struct aiocb)); | |
105 | |
106 aio->aiocb.aio_fildes = file->fd; | |
107 aio->aiocb.aio_offset = offset; | |
108 aio->aiocb.aio_buf = buf; | |
109 aio->aiocb.aio_nbytes = size; | |
110 #if (NGX_HAVE_KQUEUE) | |
111 aio->aiocb.aio_sigevent.sigev_notify_kqueue = ngx_kqueue; | |
112 aio->aiocb.aio_sigevent.sigev_notify = SIGEV_KEVENT; | |
113 aio->aiocb.aio_sigevent.sigev_value.sigval_ptr = ev; | |
114 #endif | |
115 ev->handler = ngx_file_aio_event_handler; | |
116 | |
117 n = aio_read(&aio->aiocb); | |
118 | |
119 if (n == -1) { | |
120 n = ngx_errno; | |
121 | |
122 if (n == NGX_EAGAIN) { | |
123 return ngx_read_file(file, buf, size, offset); | |
124 } | |
125 | |
126 ngx_log_error(NGX_LOG_CRIT, file->log, n, | |
127 "aio_read(\"%V\") failed", &file->name); | |
128 | |
129 if (n == NGX_ENOSYS) { | |
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130 ngx_file_aio = 0; |
3052 | 131 return ngx_read_file(file, buf, size, offset); |
132 } | |
133 | |
134 return NGX_ERROR; | |
135 } | |
136 | |
137 ngx_log_debug2(NGX_LOG_DEBUG_CORE, file->log, 0, | |
138 "aio_read: fd:%d %d", file->fd, n); | |
139 | |
140 ev->active = 1; | |
141 ev->ready = 0; | |
142 ev->complete = 0; | |
143 | |
144 return ngx_file_aio_result(aio->file, aio, ev); | |
145 } | |
146 | |
147 | |
148 static ssize_t | |
149 ngx_file_aio_result(ngx_file_t *file, ngx_event_aio_t *aio, ngx_event_t *ev) | |
150 { | |
151 int n; | |
152 ngx_err_t err; | |
153 | |
154 n = aio_error(&aio->aiocb); | |
155 | |
156 ngx_log_debug2(NGX_LOG_DEBUG_CORE, file->log, 0, | |
157 "aio_error: fd:%d %d", file->fd, n); | |
158 | |
159 if (n == -1) { | |
160 err = ngx_errno; | |
161 aio->err = err; | |
162 | |
163 ngx_log_error(NGX_LOG_ALERT, file->log, err, | |
164 "aio_error(\"%V\") failed", &file->name); | |
165 return NGX_ERROR; | |
166 } | |
167 | |
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168 if (n == NGX_EINPROGRESS) { |
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169 if (ev->ready) { |
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170 ev->ready = 0; |
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171 ngx_log_error(NGX_LOG_ALERT, file->log, n, |
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172 "aio_read(\"%V\") still in progress", |
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173 &file->name); |
3052 | 174 } |
175 | |
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176 return NGX_AGAIN; |
3052 | 177 } |
178 | |
179 n = aio_return(&aio->aiocb); | |
180 | |
181 if (n == -1) { | |
182 err = ngx_errno; | |
183 aio->err = err; | |
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184 ev->ready = 1; |
3052 | 185 |
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186 ngx_log_error(NGX_LOG_CRIT, file->log, err, |
3052 | 187 "aio_return(\"%V\") failed", &file->name); |
188 return NGX_ERROR; | |
189 } | |
190 | |
191 aio->err = 0; | |
192 aio->nbytes = n; | |
193 ev->ready = 1; | |
194 ev->active = 0; | |
195 | |
196 ngx_log_debug2(NGX_LOG_DEBUG_CORE, file->log, 0, | |
197 "aio_return: fd:%d %d", file->fd, n); | |
198 | |
199 return n; | |
200 } | |
201 | |
202 | |
203 static void | |
204 ngx_file_aio_event_handler(ngx_event_t *ev) | |
205 { | |
206 ngx_event_aio_t *aio; | |
207 | |
208 aio = ev->data; | |
209 | |
210 ngx_log_debug2(NGX_LOG_DEBUG_CORE, ev->log, 0, | |
211 "aio event handler fd:%d %V", aio->fd, &aio->file->name); | |
212 | |
213 if (ngx_file_aio_result(aio->file, aio, ev) != NGX_AGAIN) { | |
214 aio->handler(ev); | |
215 } | |
216 } |