linux-kernel - Re: [PATCH 1/3] fs: seq_file: add seq

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Date:	Thu, 22 Sep 2011 23:54:17 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Colin Cross <ccross@...roid.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [PATCH 1/3] fs: seq_file: add seq_reserve

On Thu, 22 Sep 2011 13:57:07 -0700
Colin Cross <ccross@...roid.com> wrote:

> Adds a seq_reserve function to allow users of the seq_file interface to
> increase the initial size of the buffer.  Avoids repeated allocations and
> calls to the show function in cases where large buffers of known size are
> needed.

Would it not be better to have something akin to


	void seq_set_buffer(struct seq_file *m, void *ptr, size_t size)
	{
		m->buf = ptr;
		m->size = size;
		m->private = 1;
	}

and let the caller simply provide a buffer by any means it wishes (even
statically) and free it again itself. That keeps the caller fully in
control when it wishes to be.

Alan
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