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nbd: multicast dead link notifications

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Provide a mechanism to notify userspace that there's been a link problem
on a NBD device.  This will allow userspace to re-establish a connection
and provide the new socket to the device without disrupting the device.

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Josef Bacik
2017-04-06 17:02:02 -04:00
committed by Jens Axboe
parent b7aa3d3938
commit 799f9a38bc
2 changed files with 81 additions and 14 deletions
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6
include/uapi/linux/nbd-netlink.h
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@@ -18,8 +18,9 @@
#ifndef _UAPILINUX_NBD_NETLINK_H
#define _UAPILINUX_NBD_NETLINK_H
#define NBD_GENL_FAMILY_NAME "nbd"
#define NBD_GENL_VERSION 0x1
#define NBD_GENL_FAMILY_NAME "nbd"
#define NBD_GENL_VERSION 0x1
#define NBD_GENL_MCAST_GROUP_NAME "nbd_mc_group"
/* Configuration policy attributes, used for CONNECT */
enum {
@@ -63,6 +64,7 @@ enum {
NBD_CMD_CONNECT,
NBD_CMD_DISCONNECT,
NBD_CMD_RECONFIGURE,
NBD_CMD_LINK_DEAD,
__NBD_CMD_MAX,
};
#define NBD_CMD_MAX (__NBD_CMD_MAX - 1)