From patchwork Tue May 24 07:18:30 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12859752 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 144A3C433EF for ; Tue, 24 May 2022 07:18:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234450AbiEXHSt (ORCPT ); Tue, 24 May 2022 03:18:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52704 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232183AbiEXHSs (ORCPT ); Tue, 24 May 2022 03:18:48 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:3::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 765196A02C; Tue, 24 May 2022 00:18:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=4Mm7j1fqWho1iLHItfdRGJM7noo5zmC35Du7S6y9AOw=; b=g+IH+FR/fik/efGauTIPs9QLt7 u1o2EkGaByxMnKD/YstHRteUkONsErFXERmk8X5xpRfbuQWq2BCva93UCkllD5RHPU9ovyktarH4P D+G9HpQSfPJnLYTb6Ae7q67Kije0vhm1s3ud+z/imSTWtw4gz3WycAcgH4HqqY7hPc325nx0BoJpg mXVuuORWjIgKl8qz6E9rZQtN0XFJ8QTTyxeszM8X02wuP1i3kjXOf8P39IljHFzCmbPsoZtwbHHRB id0wlre+odwq6MaGA0BDXZT9z7EGzpl7o0MUIP+6BNgp558PS7DdPO0tP56ilJfuEn45Gzky6XEjs Q0Peumvg==; Received: from [2001:4bb8:18c:7298:31fd:9579:b449:3c3a] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1ntOoY-0073FC-Kv; Tue, 24 May 2022 07:18:47 +0000 From: Christoph Hellwig To: fstests@vger.kernel.org Cc: linux-btrfs@vger.kernel.org Subject: [PATCH 1/9] btrfs: add a helpers for read repair testing Date: Tue, 24 May 2022 09:18:30 +0200 Message-Id: <20220524071838.715013-2-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220524071838.715013-1-hch@lst.de> References: <20220524071838.715013-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org Add a few helpers to consolidate code for btrfs read repair testing: - _btrfs_get_first_logical() gets the btrfs logical address for the first extent in a file - _btrfs_get_device_path and _btrfs_get_physical use the btrfs-map-logical tool to find the device path and physical address for btrfs logical address for a specific mirror - _btrfs_direct_read_on_mirror and _btrfs_buffered_read_on_mirror read the data from a specific mirror These will be used to consolidate the read repair tests and avoid duplication for new tests. Signed-off-by: Christoph Hellwig Reviewed-by: Qu Wenruo --- common/btrfs | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++ common/config | 1 + 2 files changed, 76 insertions(+) diff --git a/common/btrfs b/common/btrfs index ac597ca4..129a83f7 100644 --- a/common/btrfs +++ b/common/btrfs @@ -505,3 +505,78 @@ _btrfs_metadump() $BTRFS_IMAGE_PROG "$device" "$dumpfile" [ -n "$DUMP_COMPRESSOR" ] && $DUMP_COMPRESSOR -f "$dumpfile" &> /dev/null } + +# Return the btrfs logical address for the first block in a file +_btrfs_get_first_logical() +{ + local file=$1 + _require_command "$FILEFRAG_PROG" filefrag + + ${FILEFRAG_PROG} -v $SCRATCH_MNT/foobar >> $seqres.full + ${FILEFRAG_PROG} -v $file | _filter_filefrag | cut -d '#' -f 1 +} + +# Find the device path for a btrfs logical offset +_btrfs_get_device_path() +{ + local logical=$1 + local stripe=$2 + + _require_command "$BTRFS_MAP_LOGICAL_PROG" btrfs-map-logical + + $BTRFS_MAP_LOGICAL_PROG -l $logical $SCRATCH_DEV | \ + $AWK_PROG "(\$1 ~ /mirror/ && \$2 ~ /$stripe/) { print \$8 }" +} + + +# Find the device physical sector for a btrfs logical offset +_btrfs_get_physical() +{ + local logical=$1 + local stripe=$2 + + _require_command "$BTRFS_MAP_LOGICAL_PROG" btrfs-map-logical + + $BTRFS_MAP_LOGICAL_PROG -l $logical $SCRATCH_DEV >> $seqres.full 2>&1 + $BTRFS_MAP_LOGICAL_PROG -l $logical $SCRATCH_DEV | \ + $AWK_PROG "(\$1 ~ /mirror/ && \$2 ~ /$stripe/) { print \$6 }" +} + +# Read from a specific stripe to test read recovery that corrupted a specific +# stripe. Btrfs uses the PID to select the mirror, so keep reading until the +# xfs_io process that performed the read was executed with a PID that ends up +# on the intended mirror. +_btrfs_direct_read_on_mirror() +{ + local mirror=$1 + local nr_mirrors=$2 + local file=$3 + local offset=$4 + local size=$5 + + while [[ -z $( (( BASHPID % nr_mirrors == mirror )) && + exec $XFS_IO_PROG -d \ + -c "pread -b $size $offset $size" $file) ]]; do + : + done +} + +# Read from a specific stripe to test read recovery that corrupted a specific +# stripe. Btrfs uses the PID to select the mirror, so keep reading until the +# xfs_io process that performed the read was executed with a PID that ends up +# on the intended mirror. +_btrfs_buffered_read_on_mirror() +{ + local mirror=$1 + local nr_mirrors=$2 + local file=$3 + local offset=$4 + local size=$5 + + echo 3 > /proc/sys/vm/drop_caches + while [[ -z $( (( BASHPID % nr_mirrors == mirror )) && + exec $XFS_IO_PROG \ + -c "pread -b $size $offset $size" $file) ]]; do + : + done +} diff --git a/common/config b/common/config index c6428f90..df20afc1 100644 --- a/common/config +++ b/common/config @@ -228,6 +228,7 @@ export E2IMAGE_PROG="$(type -P e2image)" export BLKZONE_PROG="$(type -P blkzone)" export GZIP_PROG="$(type -P gzip)" export BTRFS_IMAGE_PROG="$(type -P btrfs-image)" +export BTRFS_MAP_LOGICAL_PROG=$(type -P btrfs-map-logical) # use 'udevadm settle' or 'udevsettle' to wait for lv to be settled. # newer systems have udevadm command but older systems like RHEL5 don't.