linux-kernel - Re: [PATCH 1/2] sched/wait: Add wait_event_lock_irq_timeout for TASK

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Date:   Wed, 10 Oct 2018 03:59:59 +0000
From:   "Ly, Bryant" <bly@...alogicsoftware.com>
To:     "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
CC:     target-devel <target-devel@...r.kernel.org>,
        linux-scsi <linux-scsi@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Mike Christie <mchristi@...hat.com>,
        Hannes Reinecke <hare@...e.com>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        "Bryant G. Ly" <bryantly@...ux.vnet.ibm.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Bart Van Assche <bvanassche@....org>
Subject: Re: [PATCH 1/2] sched/wait: Add wait_event_lock_irq_timeout for
 TASK_UNINTERRUPTIBLE usage

Hi Nic, 

Good to see you back!

> On Oct 9, 2018, at 10:23 PM, Nicholas A. Bellinger <nab@...ux-iscsi.org> wrote:
> 
> From: Nicholas Bellinger <nab@...ux-iscsi.org>
> 
> Short of reverting commit 00d909a107 for v4.19, target-core needs a
> wait_event_t marco can be executed using TASK_UNINTERRUPTIBLE to
> function correctly with existing fabric drivers that expect to run
> with signals pending during session shutdown and active se_cmd I/O
> quiesce.
> 
> The most notable is iscsi-target/iser-target, while ibmvscsi_tgt invokes
> session shutdown logic from userspace via configfs attribute that could
> also potentially have signals pending.
> 
> So go ahead and introduce wait_event_lock_irq_timeout() to achieve this,
> and update + rename __wait_event_lock_irq_timeout() to make it accept
> 'state' as a parameter.
> 
> Fixes: 00d909a107 ("scsi: target: Make the session shutdown code also wait for commands that are being aborted")
> Cc: Bart Van Assche <bvanassche@....org>
> Cc: Mike Christie <mchristi@...hat.com>
> Cc: Hannes Reinecke <hare@...e.com>
> Cc: Christoph Hellwig <hch@....de>
> Cc: Sagi Grimberg <sagi@...mberg.me>
> Cc: Bryant G. Ly <bryantly@...ux.vnet.ibm.com>
> Cc: Peter Zijlstra (Intel) <peterz@...radead.org>
> Tested-by: Nicholas Bellinger <nab@...ux-iscsi.org>
> Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
> ---
> include/linux/wait.h | 20 +++++++++++++++-----
> 1 file changed, 15 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/wait.h b/include/linux/wait.h
> index d9f131e..ed7c122 100644
> --- a/include/linux/wait.h
> +++ b/include/linux/wait.h
> @@ -1052,10 +1052,9 @@ void __wake_up_locked_key_bookmark(struct wait_queue_head *wq_head,
> 	__ret;									\
> })
> 
>  

I do not technically work for IBM anymore as of 3 weeks ago, but my new company is a partner… Anyways,
IBM does invoke shutdown logic from userspace. Thanks for the patch!

Reviewed-by: Bryant G. Ly <bly@...alogicsoftware.com>

-Bryant Ly