[Nbd] [PATCH 00/12] nbd: Netlink interface and path failure enhancements
This patchset adds a new netlink configuration interface to NBD as well as a
bunch of enhancments around path failures. The patches provide the following
enhancemnts to NBD
- Netlink configuration interface that doesn't leave a userspace application
waiting in kernel space for the device to disconnect.
- Netlink reconfigure interface for adding re-connected sockets to replace dead
sockets.
- A flag to destroy the NBD device on disconnect, much like how mount -o loop
works.
- A status interface that currently will only report whether a device is
connected or not, but can be extended to include whatever in the future.
- A netlink multicast notification scheme to notify user space when there are
connection issues to allow for seamless reconnects.
- Dead link handling. You can specify a dead link timeout and the NBD device
will pause IO for that timeout waiting to see if the connection can be
re-established. This is helpful to allow for things like nbd server upgrades
where the whole server disappears for a short period of time.
These patches have been thorougly and continuously tested for about a month.
I've been finding bugs in various places, but this batch has been solid for the
last few days of testing, which include a constant disconnect/reconnect torture
test. Thanks,
Josef
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