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560bc4b399
Sometimes we like to upgrade our server without making all of our clients freak out and reconnect. This patch provides a way to specify a dead connection timeout to allow us to pause all requests and wait for new connections to be opened. With this in place I can take down the nbd server for less than the dead connection timeout time and bring it back up and everything resumes gracefully. Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com>
73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
/*
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* Copyright (C) 2017 Facebook. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#ifndef _UAPILINUX_NBD_NETLINK_H
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#define _UAPILINUX_NBD_NETLINK_H
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#define NBD_GENL_FAMILY_NAME "nbd"
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#define NBD_GENL_VERSION 0x1
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#define NBD_GENL_MCAST_GROUP_NAME "nbd_mc_group"
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/* Configuration policy attributes, used for CONNECT */
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enum {
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NBD_ATTR_UNSPEC,
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NBD_ATTR_INDEX,
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NBD_ATTR_SIZE_BYTES,
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NBD_ATTR_BLOCK_SIZE_BYTES,
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NBD_ATTR_TIMEOUT,
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NBD_ATTR_SERVER_FLAGS,
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NBD_ATTR_CLIENT_FLAGS,
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NBD_ATTR_SOCKETS,
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NBD_ATTR_DEAD_CONN_TIMEOUT,
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__NBD_ATTR_MAX,
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};
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#define NBD_ATTR_MAX (__NBD_ATTR_MAX - 1)
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/*
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* This is the format for multiple sockets with NBD_ATTR_SOCKETS
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*
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* [NBD_ATTR_SOCKETS]
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* [NBD_SOCK_ITEM]
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* [NBD_SOCK_FD]
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* [NBD_SOCK_ITEM]
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* [NBD_SOCK_FD]
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*/
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enum {
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NBD_SOCK_ITEM_UNSPEC,
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NBD_SOCK_ITEM,
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__NBD_SOCK_ITEM_MAX,
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};
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#define NBD_SOCK_ITEM_MAX (__NBD_SOCK_ITEM_MAX - 1)
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enum {
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NBD_SOCK_UNSPEC,
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NBD_SOCK_FD,
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__NBD_SOCK_MAX,
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};
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#define NBD_SOCK_MAX (__NBD_SOCK_MAX - 1)
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enum {
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NBD_CMD_UNSPEC,
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NBD_CMD_CONNECT,
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NBD_CMD_DISCONNECT,
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NBD_CMD_RECONFIGURE,
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NBD_CMD_LINK_DEAD,
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__NBD_CMD_MAX,
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};
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#define NBD_CMD_MAX (__NBD_CMD_MAX - 1)
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#endif /* _UAPILINUX_NBD_NETLINK_H */
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