linux-kernel - Re: [PATCH-v2 06/12] target: Add memory allocation for bidirectional commands

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Date:	Sat, 24 Aug 2013 16:44:05 -0700
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	"Nicholas A. Bellinger" <nab@...erainc.com>,
	target-devel <target-devel@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Christoph Hellwig <hch@....de>, Hannes Reinecke <hare@...e.de>,
	Martin Petersen <martin.petersen@...cle.com>,
	Chris Mason <chris.mason@...ionio.com>,
	Roland Dreier <roland@...estorage.com>,
	James Bottomley <JBottomley@...allels.com>
Subject: Re: [PATCH-v2 06/12] target: Add memory allocation for
 bidirectional commands

On Sat, 2013-08-24 at 08:18 -0700, Christoph Hellwig wrote:
> >  static int
> > +transport_generic_get_mem_bidi(struct se_cmd *cmd)
> 
> Except for the fields touched in struct se_cmd this is a duplication
> of transport_generic_get_mem.  I'd suggest to factor that one into
> a new helper:
> 
> static int
> target_alloc_sgl(struct scatterlist **sgl, unsigned int **nents,
> 		u32 length, gfp_t gfp_mask)
> {
> 	..
> }
> 
> and then call that one from transport_generic_new_cmd directly,

Sounds reasonable enough, doing that bit of refactoring now..

> including opencoding the actual BIDI case there as a first step.
> 

Not sure why this needs to be opencoded for BIDI, instead of just doing
target_alloc_sgl(&cmd->t_bidi_data_sg, ...) for the two SCF_BIDI ||
SCF_COMPARE_AND_WRITE cases in transport_generic_new_cmd()..?

--nab

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