summaryrefslogtreecommitdiffstats
path: root/xlators/storage/posix/src/posix-aio.h
blob: 9b4a7078ecf3c9832d014961e64bf83c9c00be19 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
/*
   Copyright (c) 2006-2012 Red Hat, Inc. <http://www.redhat.com>
   This file is part of GlusterFS.

   This file is licensed to you under your choice of the GNU Lesser
   General Public License, version 3 or any later version (LGPLv3 or
   later), or the GNU General Public License, version 2 (GPLv2), in all
   cases as published by the Free Software Foundation.
*/
#ifndef _POSIX_AIO_H
#define _POSIX_AIO_H

#include "xlator.h"
#include "glusterfs.h"

// Maximum number of concurrently submitted IO events. The heaviest load
// GlusterFS has been able to handle had 60-80 concurrent calls
#define POSIX_AIO_MAX_NR_EVENTS 256

// Maximum number of completed IO operations to reap per getevents syscall
#define POSIX_AIO_MAX_NR_GETEVENTS 16

int
posix_aio_on(xlator_t *this);
int
posix_aio_off(xlator_t *this);

int
posix_readv(call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
            off_t offset, uint32_t flags, dict_t *xdata);

int
posix_writev(call_frame_t *frame, xlator_t *this, fd_t *fd,
             struct iovec *vector, int32_t count, off_t offset, uint32_t flags,
             struct iobref *iobref, dict_t *xdata);

#endif /* !_POSIX_AIO_H */