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generic/446: make sure all background processes are dead before umount

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The $dread_pid refers to the while-true-do loop, wait for $dread_pid
doesn't mean the xfs_io direct read process is already dead,
sometimes xfs_io process is still running and blocking
_scratch_unmount.

Fix it by making the direct read does a fixed number of loop and
break out the second mmap-fpunch loop if the first loop exits. At
this point we're sure that there's no unfinished background process
blocking the umount.

Reviewed-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
This commit is contained in:
Eryu Guan
2017-07-25 16:04:21 +08:00
parent 606c652eee
commit 14d318429e
1 changed files with 3 additions and 3 deletions
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tests/generic/446
+3 -3
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@@ -61,20 +61,20 @@ filesz=$((65536 * 2))
$XFS_IO_PROG -f -c "truncate $((filesz * 2))" $SCRATCH_MNT/file >> $seqres.full
# run a background dio read to a hole in a loop
while true; do
for i in `seq 0 999`; do
$XFS_IO_PROG -d -c "pread 0 $filesz" $SCRATCH_MNT/file > /dev/null 2>&1
done &
dread_pid=$!
# run mapped write to the same hole as dio read
for i in `seq 0 999`; do
# loop until background dio read exits
while kill -s 0 $dread_pid >/dev/null 2>&1; do
$XFS_IO_PROG -c "mmap 0 $filesz" -c "mwrite 0 $filesz" $SCRATCH_MNT/file \
> /dev/null
$XFS_IO_PROG -c "fpunch 0 $filesz" $SCRATCH_MNT/file > /dev/null
done
kill -9 $dread_pid > /dev/null 2>&1
wait $dread_pid > /dev/null 2>&1
echo "Silence is golden"