nbd: make the config put is called before the notifying the waiter

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There has one race case for ceph's rbd-nbd tool. When do mapping
it may fail with EBUSY from ioctl(nbd, NBD_DO_IT), but actually
the nbd device has already unmaped.

It dues to if just after the wake_up(), the recv_work() is scheduled
out and defers calling the nbd_config_put(), though the map process
has exited the "nbd->recv_task" is not cleared.

Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Xiubo Li 2020-10-13 22:45:14 -04:00 • committed by Jens Axboe

parent d8f53b0ab0

commit 87aac3a80a

1 changed files with 1 additions and 1 deletions

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drivers/block/nbd.c

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