From patchwork Wed Aug 23 01:02:39 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Darrick J. 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Wong" To: Dave Chinner Cc: xfs , fstests Subject: [RFC PATCH] fstests: test fix for an agbno overflow in __xfs_getfsmap_datadev Message-ID: <20230823010239.GE11263@frogsfrogsfrogs> References: <20230823010046.GD11286@frogsfrogsfrogs> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20230823010046.GD11286@frogsfrogsfrogs> Precedence: bulk List-ID: X-Mailing-List: fstests@vger.kernel.org From: Darrick J. Wong Dave Chinner reported that xfs/273 fails if the AG size happens to be an exact power of two. I traced this to an agbno integer overflow when the current GETFSMAP call is a continuation of a previous GETFSMAP call, and the last record returned was non-shareable space at the end of an AG. This is the regression test for that bug. Signed-off-by: Darrick J. Wong Reviewed-by: Dave Chinner --- tests/xfs/935 | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++ tests/xfs/935.out | 2 ++ 2 files changed, 57 insertions(+) create mode 100755 tests/xfs/935 create mode 100644 tests/xfs/935.out diff --git a/tests/xfs/935 b/tests/xfs/935 new file mode 100755 index 0000000000..a06f2fc8dc --- /dev/null +++ b/tests/xfs/935 @@ -0,0 +1,55 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (c) 2023 Oracle. All Rights Reserved. +# +# FS QA Test 935 +# +# Regression test for an agbno overflow bug in XFS GETFSMAP involving an +# fsmap_advance call. Userspace can indicate that a GETFSMAP call is actually +# a continuation of a previous call by setting the "low" key to the last record +# returned by the previous call. +# +# If the last record returned by GETFSMAP is a non-shareable extent at the end +# of an AG and the AG size is exactly a power of two, the startblock in the low +# key of the rmapbt query can be set to a value larger than EOAG. When this +# happens, GETFSMAP will return EINVAL instead of returning records for the +# next AG. +# +. ./common/preamble +_begin_fstest auto quick fsmap + +. ./common/filter + +_fixed_by_git_commit kernel XXXXXXXXXXXXX \ + "xfs: fix an agbno overflow in __xfs_getfsmap_datadev" + +# Modify as appropriate. +_supported_fs generic +_require_xfs_io_command fsmap +_require_xfs_scratch_rmapbt + +_scratch_mkfs | _filter_mkfs 2> $tmp.mkfs >> $seqres.full +source $tmp.mkfs + +# Find the next power of two agsize smaller than whatever the default is. +for ((p = 31; p > 0; p--)); do + desired_agsize=$((2 ** p)) + test "$desired_agsize" -lt "$agsize" && break +done + +echo "desired asize=$desired_agsize" >> $seqres.full +_scratch_mkfs -d "agsize=${desired_agsize}b" | _filter_mkfs 2> $tmp.mkfs >> $seqres.full +source $tmp.mkfs + +test "$desired_agsize" -eq "$agsize" || _notrun "wanted agsize=$desired_agsize, got $agsize" + +_scratch_mount +$XFS_IO_PROG -c 'fsmap -n 1024 -v' $SCRATCH_MNT >> $tmp.big +$XFS_IO_PROG -c 'fsmap -n 1 -v' $SCRATCH_MNT >> $tmp.small + +diff -Naurpw $tmp.big $tmp.small + +# success, all done +echo Silence is golden +status=0 +exit diff --git a/tests/xfs/935.out b/tests/xfs/935.out new file mode 100644 index 0000000000..1b5422d1e3 --- /dev/null +++ b/tests/xfs/935.out @@ -0,0 +1,2 @@ +QA output created by 935 +Silence is golden