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Re: [Nbd] [PATCH 3/3]nbd: make nbd device wait for its users

On 06/24/2016 04:09 AM, Pranay Kr. Srivastava wrote:
> When a timeout occurs or a recv fails, then
> instead of abruplty killing nbd block device


> wait for it's users to finish.


> This is more required when filesystem(s) like
> ext2 or ext3 don't expect their buffer heads to
> disappear while the filesystem is mounted.
> Each open of a nbd device is refcounted, while
> the userland program [nbd-client] doing the
> NBD_DO_IT ioctl would now wait for any other users
> of this device before invalidating the nbd device.
> A timedout or a disconnected device, if in use, can't
> be used until it has been resetted. The resetting happens


> when all tasks having this bdev open closes this bdev.
> Signed-off-by: Pranay Kr. Srivastava <pranjas@...17...>
> ---
>  drivers/block/nbd.c | 124 ++++++++++++++++++++++++++++++++++++++++------------
>  1 file changed, 96 insertions(+), 28 deletions(-)

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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