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nbd: handle dead connections

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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>
This commit is contained in:
Josef Bacik 2017-04-06 17:02:04 -04:00 • committed by Jens Axboe
parent 2516ab1543
commit 560bc4b399
2 changed files with 61 additions and 5 deletions
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1
include/uapi/linux/nbd-netlink.h
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@ -32,6 +32,7 @@ enum {
NBD_ATTR_SERVER_FLAGS,
NBD_ATTR_CLIENT_FLAGS,
NBD_ATTR_SOCKETS,
NBD_ATTR_DEAD_CONN_TIMEOUT,
__NBD_ATTR_MAX,
};
#define NBD_ATTR_MAX (__NBD_ATTR_MAX - 1)