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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
/*
* FreeBSD file AIO features and quirks:
*
* if an asked data are already in VM cache, then aio_error() returns 0,
* and the data are already copied in buffer;
*
* aio_read() preread in VM cache as minimum 16K (probably BKVASIZE);
* the first AIO preload may be up to 128K;
*
* aio_read/aio_error() may return EINPROGRESS for just written data;
*
* kqueue EVFILT_AIO filter is level triggered only: an event repeats
* until aio_return() will be called;
*
* aio_cancel() cannot cancel file AIO: it returns AIO_NOTCANCELED always.
*/
extern int ngx_kqueue;
static ssize_t ngx_file_aio_result(ngx_file_t *file, ngx_event_aio_t *aio,
ngx_event_t *ev);
static void ngx_file_aio_event_handler(ngx_event_t *ev);
ngx_int_t
ngx_file_aio_init(ngx_file_t *file, ngx_pool_t *pool)
{
ngx_event_aio_t *aio;
aio = ngx_pcalloc(pool, sizeof(ngx_event_aio_t));
if (aio == NULL) {
return NGX_ERROR;
}
aio->file = file;
aio->fd = file->fd;
aio->event.data = aio;
aio->event.ready = 1;
aio->event.log = file->log;
file->aio = aio;
return NGX_OK;
}
ssize_t
ngx_file_aio_read(ngx_file_t *file, u_char *buf, size_t size, off_t offset,
ngx_pool_t *pool)
{
int n;
ngx_event_t *ev;
ngx_event_aio_t *aio;
if (!ngx_file_aio) {
return ngx_read_file(file, buf, size, offset);
}
if (file->aio == NULL && ngx_file_aio_init(file, pool) != NGX_OK) {
return NGX_ERROR;
}
aio = file->aio;
ev = &aio->event;
if (!ev->ready) {
ngx_log_error(NGX_LOG_ALERT, file->log, 0,
"second aio post for \"%V\"", &file->name);
return NGX_AGAIN;
}
ngx_log_debug4(NGX_LOG_DEBUG_CORE, file->log, 0,
"aio complete:%d @%O:%uz %V",
ev->complete, offset, size, &file->name);
if (ev->complete) {
ev->complete = 0;
ngx_set_errno(aio->err);
if (aio->err == 0) {
return aio->nbytes;
}
ngx_log_error(NGX_LOG_CRIT, file->log, ngx_errno,
"aio read \"%s\" failed", file->name.data);
return NGX_ERROR;
}
ngx_memzero(&aio->aiocb, sizeof(struct aiocb));
aio->aiocb.aio_fildes = file->fd;
aio->aiocb.aio_offset = offset;
aio->aiocb.aio_buf = buf;
aio->aiocb.aio_nbytes = size;
#if (NGX_HAVE_KQUEUE)
aio->aiocb.aio_sigevent.sigev_notify_kqueue = ngx_kqueue;
aio->aiocb.aio_sigevent.sigev_notify = SIGEV_KEVENT;
aio->aiocb.aio_sigevent.sigev_value.sigval_ptr = ev;
#endif
ev->handler = ngx_file_aio_event_handler;
n = aio_read(&aio->aiocb);
if (n == -1) {
n = ngx_errno;
if (n == NGX_EAGAIN) {
return ngx_read_file(file, buf, size, offset);
}
ngx_log_error(NGX_LOG_CRIT, file->log, n,
"aio_read(\"%V\") failed", &file->name);
if (n == NGX_ENOSYS) {
ngx_file_aio = 0;
return ngx_read_file(file, buf, size, offset);
}
return NGX_ERROR;
}
ngx_log_debug2(NGX_LOG_DEBUG_CORE, file->log, 0,
"aio_read: fd:%d %d", file->fd, n);
ev->active = 1;
ev->ready = 0;
ev->complete = 0;
return ngx_file_aio_result(aio->file, aio, ev);
}
static ssize_t
ngx_file_aio_result(ngx_file_t *file, ngx_event_aio_t *aio, ngx_event_t *ev)
{
int n;
ngx_err_t err;
n = aio_error(&aio->aiocb);
ngx_log_debug2(NGX_LOG_DEBUG_CORE, file->log, 0,
"aio_error: fd:%d %d", file->fd, n);
if (n == -1) {
err = ngx_errno;
aio->err = err;
ngx_log_error(NGX_LOG_ALERT, file->log, err,
"aio_error(\"%V\") failed", &file->name);
return NGX_ERROR;
}
if (n == NGX_EINPROGRESS) {
if (ev->ready) {
ev->ready = 0;
ngx_log_error(NGX_LOG_ALERT, file->log, n,
"aio_read(\"%V\") still in progress",
&file->name);
}
return NGX_AGAIN;
}
n = aio_return(&aio->aiocb);
if (n == -1) {
err = ngx_errno;
aio->err = err;
ev->ready = 1;
ngx_log_error(NGX_LOG_CRIT, file->log, err,
"aio_return(\"%V\") failed", &file->name);
return NGX_ERROR;
}
aio->err = 0;
aio->nbytes = n;
ev->ready = 1;
ev->active = 0;
ngx_log_debug2(NGX_LOG_DEBUG_CORE, file->log, 0,
"aio_return: fd:%d %d", file->fd, n);
return n;
}
static void
ngx_file_aio_event_handler(ngx_event_t *ev)
{
ngx_event_aio_t *aio;
aio = ev->data;
ngx_log_debug2(NGX_LOG_DEBUG_CORE, ev->log, 0,
"aio event handler fd:%d %V", aio->fd, &aio->file->name);
if (ngx_file_aio_result(aio->file, aio, ev) != NGX_AGAIN) {
aio->handler(ev);
}
}
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