From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: [PATCH 0/2] Introduce the request handling for dm-crypt Date: Wed, 11 Nov 2015 01:48:11 -0800 Message-ID: <20151111094811.GA3641@infradead.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Baolin Wang Cc: axboe@kernel.dk, agk@redhat.com, snitzer@redhat.com, dm-devel@redhat.com, neilb@suse.com, jack@suse.cz, tj@kernel.org, jmoyer@redhat.com, keith.busch@intel.com, bart.vanassche@sandisk.com, linux-raid@vger.kernel.org, broonie@kernel.org, arnd@arndb.de, dineshg@quicinc.com, linux-kernel@vger.kernel.org List-Id: linux-raid.ids On Wed, Nov 11, 2015 at 05:31:43PM +0800, Baolin Wang wrote: > Now the dm-crypt code only implemented the 'based-bio' method to encrypt/ > decrypt block data, which can only hanle one bio at one time. As we know, > one bio must use the sequential physical address and it also has a limitation > of length. Thus it may limit the big block encyrtion/decryption when some > hardware support the big block data encryption. > > This patch series introduc the 'based-request' method to handle the data > encryption/decryption. One request can contain multiple bios, so it can > handle big block data to improve the efficiency. NAK for more request based stacking or DM drivers. They are a major pain to deal with, and adding more with different requirements then dm-multipath is not helping in actually making that one work properly.