linux-kernel - Re: [PATCH-v2 2/9] target/pr: Use atomic bitop for se_dev_entry->pr

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Message-ID: <20150522082614.GA24640@lst.de>
Date:	Fri, 22 May 2015 10:26:14 +0200
From:	Christoph Hellwig <hch@....de>
To:	"Nicholas A. Bellinger" <nab@...erainc.com>
Cc:	target-devel <target-devel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Hannes Reinecke <hare@...e.de>, Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagig@...lanox.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: Re: [PATCH-v2 2/9] target/pr: Use atomic bitop for
	se_dev_entry->pr_reg reservation check

On Fri, May 22, 2015 at 06:11:04AM +0000, Nicholas A. Bellinger wrote:
> +	clear_bit(1, &orig->pr_reg);

Can you call it ->flags and give the bit a meaningful name?

> diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
> index c0b593a..d29b39c 100644
> --- a/drivers/target/target_core_pr.c
> +++ b/drivers/target/target_core_pr.c
> @@ -327,9 +327,13 @@ static int core_scsi3_pr_seq_non_holder(
>  	int we = 0; /* Write Exclusive */
>  	int legacy = 0; /* Act like a legacy device and return
>  			 * RESERVATION CONFLICT on some CDBs */
> +	bool registered = false;
>  
>  	rcu_read_lock();
>  	se_deve = target_nacl_find_deve(nacl, cmd->orig_fe_lun);
> +	if (se_deve)
> +		registered = test_bit(1, &se_deve->pr_reg);
> +	rcu_read_unlock();

It would be good to just sort out the registered and co variables
here before the RCU changes, as in:

http://git.infradead.org/users/hch/scsi.git/commitdiff/6372d9f62c83acb30d051387c40deb4dbdcaa376
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