linux-kernel - Re: [PATCH 3/6] cifs: quit playing games with draining iovecs

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Message-ID: <20160419224136.GD25498@ZenIV.linux.org.uk>
Date:	Tue, 19 Apr 2016 23:41:36 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Jeff Layton <jlayton@...chiereds.net>
Cc:	linux-cifs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/6] cifs: quit playing games with draining iovecs

On Tue, Apr 19, 2016 at 01:53:17PM -0400, Jeff Layton wrote:

> What's the advantage of using iov_iter_bvec over iov_iter_kvec ?

No need to screw with kmap() in the caller; moreover, when it comes to actual
copying it gets away with kmap_atomic() just around the memcpy(), which is
considerably cheaper.