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* Copyright (C) Igor Sysoev
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* Copyright (C) Nginx, Inc.
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#include <ngx_config.h>
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#include <ngx_event.h>
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extern int ngx_eventfd;
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extern aio_context_t ngx_aio_ctx;
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static void ngx_file_aio_event_handler(ngx_event_t *ev);
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io_submit(aio_context_t ctx, long n, struct iocb **paiocb)
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return syscall(SYS_io_submit, ctx, n, paiocb);
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ngx_file_aio_read(ngx_file_t *file, u_char *buf, size_t size, off_t offset,
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struct iocb *piocb[1];
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return ngx_read_file(file, buf, size, offset);
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aio = ngx_pcalloc(pool, sizeof(ngx_event_aio_t));
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aio->event.data = aio;
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aio->event.log = file->log;
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ngx_log_error(NGX_LOG_ALERT, file->log, 0,
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"second aio post for \"%V\"", &file->name);
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ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0,
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"aio complete:%d @%O:%z %V",
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ev->complete, offset, size, &file->name);
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ngx_set_errno(-aio->res);
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ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
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"aio read \"%s\" failed", file->name.data);
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ngx_memzero(&aio->aiocb, sizeof(struct iocb));
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aio->aiocb.aio_data = (uint64_t) (uintptr_t) ev;
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aio->aiocb.aio_lio_opcode = IOCB_CMD_PREAD;
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aio->aiocb.aio_fildes = file->fd;
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aio->aiocb.aio_buf = (uint64_t) (uintptr_t) buf;
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aio->aiocb.aio_nbytes = size;
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aio->aiocb.aio_offset = offset;
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aio->aiocb.aio_flags = IOCB_FLAG_RESFD;
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aio->aiocb.aio_resfd = ngx_eventfd;
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ev->handler = ngx_file_aio_event_handler;
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piocb[0] = &aio->aiocb;
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if (io_submit(ngx_aio_ctx, 1, piocb) == 1) {
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if (err == NGX_EAGAIN) {
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return ngx_read_file(file, buf, size, offset);
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ngx_log_error(NGX_LOG_CRIT, file->log, err,
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"io_submit(\"%V\") failed", &file->name);
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if (err == NGX_ENOSYS) {
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return ngx_read_file(file, buf, size, offset);
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ngx_file_aio_event_handler(ngx_event_t *ev)
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ngx_event_aio_t *aio;
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ngx_log_debug2(NGX_LOG_DEBUG_CORE, ev->log, 0,
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"aio event handler fd:%d %V", aio->fd, &aio->file->name);