From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752719Ab3KDLgh (ORCPT ); Mon, 4 Nov 2013 06:36:37 -0500 Received: from mx1.redhat.com ([209.132.183.28]:42603 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752012Ab3KDLgU (ORCPT ); Mon, 4 Nov 2013 06:36:20 -0500 From: Steven Whitehouse To: cluster-devel@redhat.com, linux-kernel@vger.kernel.org Cc: Bob Peterson , Steven Whitehouse Subject: [PATCH 03/19] GFS2: introduce bi_blocks for optimization Date: Mon, 4 Nov 2013 11:09:26 +0000 Message-Id: <1383563382-8535-4-git-send-email-swhiteho@redhat.com> In-Reply-To: <1383563382-8535-1-git-send-email-swhiteho@redhat.com> References: <1383563382-8535-1-git-send-email-swhiteho@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Bob Peterson This patch introduces a new field in the bitmap structure called bi_blocks. Its purpose is to save us from constantly multiplying bi_len by the constant GFS2_NBBY. It also paves the way for more optimization in a future patch. Signed-off-by: Bob Peterson Signed-off-by: Steven Whitehouse diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h index 26aabd7..f1a3243 100644 --- a/fs/gfs2/incore.h +++ b/fs/gfs2/incore.h @@ -71,6 +71,7 @@ struct gfs2_bitmap { u32 bi_offset; u32 bi_start; u32 bi_len; + u32 bi_blocks; }; struct gfs2_rgrpd { diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c index 7a6fa03..7d64a27 100644 --- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -262,7 +262,7 @@ static int gfs2_rbm_from_block(struct gfs2_rbm *rbm, u64 block) rbm->bi = rbm->rgd->rd_bits; rbm->offset = (u32)(rblock); /* Check if the block is within the first block */ - if (rbm->offset < rbm->bi->bi_len * GFS2_NBBY) + if (rbm->offset < rbm->bi->bi_blocks) return 0; /* Adjust for the size diff between gfs2_meta_header and gfs2_rgrp */ @@ -743,18 +743,21 @@ static int compute_bitstructs(struct gfs2_rgrpd *rgd) bi->bi_offset = sizeof(struct gfs2_rgrp); bi->bi_start = 0; bi->bi_len = bytes; + bi->bi_blocks = bytes * GFS2_NBBY; /* header block */ } else if (x == 0) { bytes = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_rgrp); bi->bi_offset = sizeof(struct gfs2_rgrp); bi->bi_start = 0; bi->bi_len = bytes; + bi->bi_blocks = bytes * GFS2_NBBY; /* last block */ } else if (x + 1 == length) { bytes = bytes_left; bi->bi_offset = sizeof(struct gfs2_meta_header); bi->bi_start = rgd->rd_bitbytes - bytes_left; bi->bi_len = bytes; + bi->bi_blocks = bytes * GFS2_NBBY; /* other blocks */ } else { bytes = sdp->sd_sb.sb_bsize - @@ -762,6 +765,7 @@ static int compute_bitstructs(struct gfs2_rgrpd *rgd) bi->bi_offset = sizeof(struct gfs2_meta_header); bi->bi_start = rgd->rd_bitbytes - bytes_left; bi->bi_len = bytes; + bi->bi_blocks = bytes * GFS2_NBBY; } bytes_left -= bytes; -- 1.7.4.4