linux-kernel - Re: [PATCH 2.6.32 02/38] [PATCH 02/38] Failing to send a CLOSE if file is opened WRONLY and server reboots on a 4.x mount

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Message-ID: <20151130064433.GA31698@1wt.eu>
Date:	Mon, 30 Nov 2015 07:44:33 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Olga Kornievskaia <aglo@...ch.edu>,
	Trond Myklebust <trond.myklebust@...marydata.com>
Subject: Re: [PATCH 2.6.32 02/38] [PATCH 02/38] Failing to send a CLOSE if file is opened WRONLY and server reboots on a 4.x mount

resending.

On Sun, Nov 29, 2015 at 10:47:04PM +0100, Willy Tarreau wrote:
> 2.6.32-longterm review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> commit a41cbe86df3afbc82311a1640e20858c0cd7e065 upstream.
> 
> A test case is as the description says:
> open(foobar, O_WRONLY);
> sleep()  --> reboot the server
> close(foobar)
> 
> The bug is because in nfs4state.c in nfs4_reclaim_open_state() a few
> line before going to restart, there is
> clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &state->flags).
> 
> NFS4CLNT_RECLAIM_NOGRACE is a flag for the client states not open
> owner states. Value of NFS4CLNT_RECLAIM_NOGRACE is 4 which is the
> value of NFS_O_WRONLY_STATE in nfs4_state->flags. So clearing it wipes
> out state and when we go to close it, âcall_closeâ doesnât get set as
> state flag is not set and CLOSE doesnât go on the wire.
> 
> Signed-off-by: Olga Kornievskaia <aglo@...ch.edu>
> Signed-off-by: Trond Myklebust <trond.myklebust@...marydata.com>
> Signed-off-by: Willy Tarreau <w@....eu>
> ---
>  fs/nfs/nfs4state.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
> index 71ee6f6..614446b 100644
> --- a/fs/nfs/nfs4state.c
> +++ b/fs/nfs/nfs4state.c
> @@ -929,7 +929,7 @@ restart:
>  							__func__);
>  				}
>  				nfs4_put_open_state(state);
> -				clear_bit(NFS4CLNT_RECLAIM_NOGRACE,
> +				clear_bit(NFS_STATE_RECLAIM_NOGRACE,
>  					&state->flags);
>  				goto restart;
>  			}
> -- 
> 1.7.12.2.21.g234cd45.dirty
> 
> 
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