debuggers.hg

view tools/blktap2/drivers/tapdisk-utils.h @ 20918:b0ffb4912c46

blktap2: Prefer AIO eventfd support on kernels >= 2.6.22

Mainline kernel support for eventfd(2) in linux aio was added between
2.6.21 and 2.6.22. Libaio after 0.3.107 has the header file, but
presently few systems support it. Neither do we rely on an up-to-date
libc6.

Instead, this patch adds a header which defines custom iocb_common
struct, and works around a potentially missing sys/eventfd.h.

Signed-off-by: Daniel Stodden <daniel.stodden@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Fri Jan 29 08:55:27 2010 +0000 (2010-01-29)
parents 1c627434605e
children 3ffdb094c2c0
line source
1 /*
2 * Copyright (c) 2008, XenSource Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of XenSource Inc. nor the names of its contributors
13 * may be used to endorse or promote products derived from this software
14 * without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
20 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
24 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
25 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28 #ifndef _TAPDISK_UTILS_H_
29 #define _TAPDISK_UTILS_H_
31 #include <inttypes.h>
33 #define MAX_NAME_LEN 1000
35 void tapdisk_start_logging(const char *);
36 void tapdisk_stop_logging(void);
37 int tapdisk_set_resource_limits(void);
38 int tapdisk_namedup(char **, const char *);
39 int tapdisk_parse_disk_type(const char *, char **, int *);
40 int tapdisk_get_image_size(int, uint64_t *, uint32_t *);
41 int tapdisk_linux_version(void);
43 #endif