nbd: factor out a nbd_genl_foreach_sock

The NBD_ATTR_SOCKETS walk is duplicated in nbd_genl_connect (add sockets)
and nbd_genl_reconfigure (reconnect).  Factor out a single helper that
walks the list and calls a callback per fd; with a NULL callback it is a
pure counter, used by a later patch to learn nr_hw_queues before the
device exists.  Returns the number of fds walked (>= 0) or a negative
errno; a callback >0 will stops early.

Reviewed-by: Yu Kuai <yukuai@fygo.io>
Signed-off-by: Yang Erkun <yangerkun@huawei.com>
Link: https://patch.msgid.link/20260805122930.57647-7-yangerkun@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

0 files changed, 0 insertions, 0 deletions