From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Vesely Subject: block: Allow merging of tail pages into the last segment Date: Thu, 28 Mar 2013 10:38:27 +0100 Message-ID: <1364463509-24975-1-git-send-email-jvesely@redhat.com> Cc: James.Bottomley@hansenpartnership.com, viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org To: linux-scsi@vger.kernel.org, axboe@kernel.dk Return-path: Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org Hi These patches modify __bio_add_page to accept pages that extent the last bio segment. some drivers craft their buffers and rely on this behavior (see message in patch 2 for details) jan v3: Use code from __blk_recalc_rq_segments to decide whether the page is mergeable, v2: modify a comment Jan Vesely (2): block: factor out vector mergeable decision to a helper function block: modify __bio_add_page check to accept pages that don't start a new block/blk-merge.c | 52 +++++++++++++++++++++++++++++++--------------------- fs/bio.c | 29 ++++++++++++++++++----------- include/linux/bio.h | 3 +++ 3 files changed, 52 insertions(+), 32 deletions(-)