linux-kernel - Re: [PATCH 4/4] staging: lustre: obdclass: change object lookup to no wait mode

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Date:   Sun, 6 May 2018 18:47:34 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     James Simmons <jsimmons@...radead.org>
Cc:     devel@...verdev.osuosl.org,
        Andreas Dilger <andreas.dilger@...el.com>,
        Oleg Drokin <oleg.drokin@...el.com>,
        Lai Siyao <lai.siyao@...el.com>,
        Jinshan Xiong <jinshan.xiong@...el.com>,
        NeilBrown <neilb@...e.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lustre Development List <lustre-devel@...ts.lustre.org>
Subject: Re: [PATCH 4/4] staging: lustre: obdclass: change object lookup to
 no wait mode

On Wed, May 02, 2018 at 02:21:48PM -0400, James Simmons wrote:
> From: Lai Siyao <lai.siyao@...el.com>
> 
> Currently we set LU_OBJECT_HEARD_BANSHEE on object when we want
> to remove object from cache, but this may lead to deadlock, because
> when other process lookup such object, it needs to wait for this
> object until release (done at last refcount put), while that process
> maybe already hold an LDLM lock.
> 
> Now that current code can handle dying object correctly, we can just
> return such object in lookup, thus the above deadlock can be avoided.
> 
> Signed-off-by: Lai Siyao <lai.siyao@...el.com>
> Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-9049
> Reviewed-on: https://review.whamcloud.com/26965
> Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@...el.com>
> Tested-by: Cliff White <cliff.white@...el.com>
> Reviewed-by: Fan Yong <fan.yong@...el.com>
> Reviewed-by: Oleg Drokin <oleg.drokin@...el.com>
> Signed-off-by: James Simmons <jsimmons@...radead.org>
> ---
>  drivers/staging/lustre/lustre/include/lu_object.h  |  2 +-
>  drivers/staging/lustre/lustre/obdclass/lu_object.c | 82 +++++++++-------------
>  2 files changed, 36 insertions(+), 48 deletions(-)

Patch does not apply to my tree :(