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#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2023 Oracle. All Rights Reserved.
#
# FS QA Test No. 600
#
# 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 cfa2df68b7ce \
"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
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