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Re: [PATCH v3 2/2] nbd: add comments about double lock for config_lock confusion

On 11/3/20 1:51 AM, xiubli@redhat.com wrote:
From: Xiubo Li <xiubli@redhat.com>

When calling the ioctl(), fget() will be called on this fd, and
nbd_release() is only called when the fd's refcount drops to zero.
With this we can make sure that the nbd_release() won't be called
before the ioctl() finished.

So there won't have the double lock issue for the "config_lock",
which has already been held by nbd_ioctl().

Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Xiubo Li <xiubli@redhat.com>

Reviewed-by: Josef Bacik <josef@toxicpanda.com>



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