From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: [PATCH 2/2] block: defer the use of inline biovecs for discard requests Date: Sun, 27 Jun 2010 11:39:55 +0200 Message-ID: <20100627093955.GD12016@lst.de> References: <20100622180029.GA15950@redhat.com> <1277582211-10725-2-git-send-email-snitzer@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1277582211-10725-2-git-send-email-snitzer@redhat.com> Sender: linux-kernel-owner@vger.kernel.org To: Mike Snitzer Cc: Christoph Hellwig , axboe@kernel.dk, dm-devel@redhat.com, James.Bottomley@suse.de, linux-kernel@vger.kernel.org, martin.petersen@oracle.com, akpm@linux-foundation.org List-Id: dm-devel.ids On Sat, Jun 26, 2010 at 03:56:51PM -0400, Mike Snitzer wrote: > Don't alloc discard bio with a biovec in blkdev_issue_discard. Doing so > means bio_has_data() will not be true until the SCSI layer adds the > payload to the discard request via blk_add_request_payload. > > bio_{enable,disable}_inline_vecs are not expected to be widely used so > they were exported using EXPORT_SYMBOL_GPL. Why do we need them exported at all? Also some comments on these functions would be useful. Otherwise it looks good to me.