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251: make fstrim call a bit more random

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To cover cases when fstrim arguments are not block/block group/file
system size aligned, we can be a bit more random. This commit changes
fstrim argument computing to use $RANDOM bash variable in order to have
different minlen, start, len argument settings and change the full fs
fstrim to be called randomly as well.

Also make kill and wait not complain about non existent process, since
it may have already finished before we attempt to kill it and wait for
it. No reason to fail the test.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Lukas Czerner
2012-03-01 09:15:16 +01:00
committed by Christoph Hellwig
parent 65a708d11f
commit 0966519543
1 changed files with 25 additions and 11 deletions
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251
+25 -11
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@@ -54,21 +54,21 @@ _cleanup()
_destroy() _destroy()
{ {
kill $pids $fstrim_pid kill $pids $fstrim_pid 2> /dev/null
wait $pids $fstrim_pid wait $pids $fstrim_pid 2> /dev/null
rm -rf $tmp rm -rf $tmp
} }
_destroy_fstrim() _destroy_fstrim()
{ {
kill $fpid kill $fpid 2> /dev/null
wait $fpid wait $fpid 2> /dev/null
} }
_fail() _fail()
{ {
echo "$1" echo "$1"
kill $mypid kill $mypid 2> /dev/null
} }
_check_fstrim_support() _check_fstrim_support()
@@ -76,6 +76,16 @@ _check_fstrim_support()
$here/src/fstrim -l 10M $SCRATCH_MNT &> /dev/null $here/src/fstrim -l 10M $SCRATCH_MNT &> /dev/null
} }
_guess_max_minlen()
{
mmlen=100000
while [ $mmlen -gt 1 ]; do
$here/src/fstrim -l $(($mmlen*2))k -m ${mmlen}k $SCRATCH_MNT &> /dev/null && break
mmlen=$(($mmlen/2))
done
echo $mmlen
}
## ##
# Background FSTRIM loop. We are trimming the device in the loop and for # Background FSTRIM loop. We are trimming the device in the loop and for
# test coverage, we are doing whole device trim followed by several smaller # test coverage, we are doing whole device trim followed by several smaller
@@ -85,15 +95,19 @@ fstrim_loop()
{ {
trap "_destroy_fstrim; exit \$status" 2 15 trap "_destroy_fstrim; exit \$status" 2 15
fsize=$(df | grep $SCRATCH_MNT | grep $SCRATCH_DEV | awk '{print $2}') fsize=$(df | grep $SCRATCH_MNT | grep $SCRATCH_DEV | awk '{print $2}')
mmlen=$(_guess_max_minlen)
while true ; do while true ; do
step=1048576 step=$((RANDOM*$RANDOM))
start=0 minlen=$(((RANDOM*($RANDOM%2+1))%$mmlen))
$here/src/fstrim $SCRATCH_MNT & start=$RANDOM
fpid=$! if [ $((RANDOM%10)) -gt 7 ]; then
wait $fpid $here/src/fstrim $SCRATCH_MNT &
fpid=$!
wait $fpid
fi
while [ $start -lt $fsize ] ; do while [ $start -lt $fsize ] ; do
$here/src/fstrim -s ${start}k -l ${step}k $SCRATCH_MNT & $here/src/fstrim -m ${minlen}k -s ${start}k -l ${step}k $SCRATCH_MNT &
fpid=$! fpid=$!
wait $fpid wait $fpid
start=$(( $start + $step )) start=$(( $start + $step ))