linux-kernel - Re: [PATCH-for-4.6 1/6] target: Add target_alloc

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Date:	Wed, 13 Jan 2016 00:09:26 -0800
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Christoph Hellwig <hch@....de>
Cc:	"Nicholas A. Bellinger" <nab@...erainc.com>,
	target-devel <target-devel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Sagi Grimberg <sagig@...lanox.com>,
	Hannes Reinecke <hare@...e.de>,
	Andy Grover <agrover@...hat.com>,
	Vasu Dev <vasu.dev@...ux.intel.com>, Vu Pham <vu@...lanox.com>
Subject: Re: [PATCH-for-4.6 1/6] target: Add target_alloc_session() helper
 function

On Tue, 2016-01-12 at 16:11 +0100, Christoph Hellwig wrote:
> > +struct se_session *
> > +target_alloc_session(struct se_portal_group *tpg,
> > +		     unsigned int tag_num, unsigned int tag_size,
> > +		     enum target_prot_op prot_op,
> > +		     const char *initiatorname, void *private,
> > +		     int (*callback)(struct se_portal_group *,
> > +				     struct se_session *, void *))
> > +{
> 
> I'd much rather have the fabrics drivers call transport_alloc_session_tags
> directly from the callback than growing even more arguments here.
> 

What's the point..?

Only vhost-scsi currently needs to allocate extra resources for
se_session percpu-ida tag pre-allocation.

The rest of the consumers can just use this common code.

> > +	struct se_session *sess;
> > +
> > +	if (tag_num != 0 && !tag_size) {
> > +		pr_err("target_alloc_session called with percpu-ida tag_num:"
> > +		       " %u, but zero tag_size\n", tag_num);
> > +		return ERR_PTR(-EINVAL);
> > +	}
> > +	if (!tag_num && tag_size) {
> > +		pr_err("target_alloc_session called with percpu-ida tag_size:"
> > +		       " %u, but zero tag_num\n", tag_size);
> > +		return ERR_PTR(-EINVAL);
> > +	}
> 
> These checks should be in transport_alloc_session_tags.
> 

Done.