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When directly corrupting RAID images for the purpose of testing, we must use direct I/O (or a 'sync' after the 'dd') to ensure that the writes are not caught in the buffer cache in a way that is not reachable by the top-level RAID device.
58 lines
1.6 KiB
Bash
58 lines
1.6 KiB
Bash
#!/bin/sh
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# Copyright (C) 2014 Red Hat, Inc. All rights reserved.
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#
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# This copyrighted material is made available to anyone wishing to use,
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# modify, copy, or redistribute it subject to the terms and conditions
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# of the GNU General Public License v.2.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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# test activation race for raid's --syncaction check
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. lib/test
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# Proper mismatch count 1.5.2+ upstream, 1.3.5 < x < 1.4.0 in RHEL6
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aux have_raid 1 3 5 &&
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! aux have_raid 1 4 0 ||
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aux have_raid 1 5 2 || skip
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aux prepare_vg 3
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lvcreate -n $lv1 $vg -l1 --type raid1
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START=$(get pv_field "$dev2" pe_start --units 1k)
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METASIZE=$(get lv_field $vg/${lv1}_rmeta_1 size -a --units 1k)
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SEEK=$((${START%\.00k} + ${METASIZE%\.00k}))
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# Overwrite some portion of _rimage_1
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dd if=/dev/urandom of="$dev2" bs=1K count=1 seek=$SEEK oflag=direct
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lvchange --syncaction check $vg/$lv1
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check lv_field $vg/$lv1 raid_mismatch_count "128"
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# Let's deactivate
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lvchange -an $vg/$lv1
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# Slow down write by 100ms
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aux delay_dev "$dev2" 0 100
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lvchange -ay $vg/$lv1
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# noone has it open and target is read & running
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dmsetup info -c
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#sleep 10 < "$DM_DEV_DIR/$vg/$lv1" &
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# "check" should find discrepancies but not change them
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# 'lvs' should show results
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# FIXME
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# this looks like some race with 'write' during activation
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# and syncaction...
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# For now it fails with:
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# device-mapper: message ioctl on failed: Device or resource busy
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#
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lvchange --syncaction check $vg/$lv1
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aux enable_dev "$dev2"
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lvs -o+raid_mismatch_count -a $vg
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vgremove -ff $vg
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