From: Yongqiang Yang Subject: [PATCH 3/4] ext4: accelerate updating of backup gdb Date: Mon, 30 Jan 2012 00:01:05 +0800 Message-ID: <1327852866-4448-4-git-send-email-xiaoqiangnk@gmail.com> References: <1327852866-4448-1-git-send-email-xiaoqiangnk@gmail.com> Cc: adilger@gmail.com, Yongqiang Yang To: linux-ext4@vger.kernel.org Return-path: Received: from mail-iy0-f174.google.com ([209.85.210.174]:38287 "EHLO mail-iy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756382Ab2CVNle (ORCPT ); Thu, 22 Mar 2012 09:41:34 -0400 Received: by mail-iy0-f174.google.com with SMTP id z16so3130313iag.19 for ; Thu, 22 Mar 2012 06:41:34 -0700 (PDT) In-Reply-To: <1327852866-4448-1-git-send-email-xiaoqiangnk@gmail.com> Sender: linux-ext4-owner@vger.kernel.org List-ID: Updating of backup group descriptor blocks shoud done in the unit of gdb, rather than group. Signed-off-by: Yongqiang Yang --- fs/ext4/resize.c | 11 +++++++---- 1 files changed, 7 insertions(+), 4 deletions(-) diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c index 58109fa..3999a19 100644 --- a/fs/ext4/resize.c +++ b/fs/ext4/resize.c @@ -1290,15 +1290,18 @@ exit_journal: err = err2; if (!err) { - int i; + int gdb_num, gdb_num_end; ext4_fsblk_t first_block; + first_block = ext4_group_first_block_no(sb, 0); update_backups(sb, sbi->s_sbh->b_blocknr - first_block, (char *)es, sizeof(struct ext4_super_block)); - for (i = 0; i < flex_gd->count; i++, group++) { + + gdb_num = group / EXT4_DESC_PER_BLOCK(sb); + gdb_num_end = (group + flex_gd->count - 1) / + EXT4_DESC_PER_BLOCK(sb); + for (; gdb_num <= gdb_num_end; gdb_num++) { struct buffer_head *gdb_bh; - int gdb_num; - gdb_num = group / EXT4_BLOCKS_PER_GROUP(sb); gdb_bh = sbi->s_group_desc[gdb_num]; update_backups(sb, gdb_bh->b_blocknr - first_block, gdb_bh->b_data, gdb_bh->b_size); -- 1.7.5.1