From: Theodore Ts'o Subject: Re: [PATCH] crypto: allow to assign gfp_t for __crypto_alloc_tfm Date: Tue, 19 May 2015 10:39:04 -0400 Message-ID: <20150519143904.GA25684@thunk.org> References: <1432014416-39326-1-git-send-email-jaegeuk@kernel.org> <20150519054945.GA28060@gondor.apana.org.au> <20150519062430.GA39588@jaegeuk-mac02.hsd1.ca.comcast.net> <20150519063211.GA28347@gondor.apana.org.au> <20150519065812.GA40012@jaegeuk-mac02.hsd1.ca.comcast.net> <20150519065929.GA28610@gondor.apana.org.au> <20150519071317.GB40012@jaegeuk-mac02.hsd1.ca.comcast.net> <20150519071521.GA28862@gondor.apana.org.au> <20150519141430.GD20421@thunk.org> <20150519142755.GB32663@gondor.apana.org.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Jaegeuk Kim , davem@davemloft.net, linux-crypto@vger.kernel.org, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, ecryptfs@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Steffen Klassert , mhalcrow@google.com To: Herbert Xu Return-path: Received: from imap.thunk.org ([74.207.234.97]:45184 "EHLO imap.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750747AbbESOje (ORCPT ); Tue, 19 May 2015 10:39:34 -0400 Content-Disposition: inline In-Reply-To: <20150519142755.GB32663@gondor.apana.org.au> Sender: linux-crypto-owner@vger.kernel.org List-ID: On Tue, May 19, 2015 at 10:27:55PM +0800, Herbert Xu wrote: > On Tue, May 19, 2015 at 10:14:30AM -0400, Theodore Ts'o wrote: > > > > There can be multiple reads going on in parallel, so we're currently > > creating tfm's as necessary. In fact one of the things that we've > > A single tfm is fully-reentrant (as long as you don't change the > key). So multiple reads/writes on a single file can all use one > tfm with no locking at all. Cool, we didn't realize this was the case. Excellent, this makes life much simpler for us! :-) Thanks, - Ted