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Date:   Sat, 04 May 2019 00:10:25 -0400 (EDT)
From:   David Miller <>
Subject: Re: [PATCH 2/3] netns: add netns_evict into netns_operations

From: Wenbin Zeng <>
Date: Wed,  1 May 2019 14:42:24 +0800

> The newly added netns_evict() shall be called when the netns inode being
> evicted. It provides another path to release netns refcounts, previously
> netns_put() is the only choice, but it is not able to release all netns
> refcount, for example, a rpc client holds two netns refcounts, these
> refcounts are supposed to be released when the rpc client is freed, but
> the code to free rpc client is normally triggered by put() callback only
> when netns refcount gets to 0, specifically:
>     refcount=0 -> cleanup_net() -> ops_exit_list -> free rpc client
> But netns refcount will never get to 0 before rpc client gets freed, to
> break the deadlock, the code to free rpc client can be put into the newly
> added netns_evict.
> Signed-off-by: Wenbin Zeng <>

Acked-by: David S. Miller <>

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