@@ -77,11 +77,14 @@ _load_flakey_table()
$DMSETUP_PROG suspend $suspend_opt flakey-test
[ $? -ne 0 ] && _fatal "failed to suspend flakey-test"
- $DMSETUP_PROG load flakey-test --table "$table"
+ # There may be multiple dm targets in the table, and these dm targets
+ # will be joined by the newline ("\n"). Option --table can not cope with
+ # the multiple-targets case, so get them by reading from standard input.
+ echo -e "$table" | $DMSETUP_PROG load flakey-test
[ $? -ne 0 ] && _fatal "failed to load table into flakey-test"
$DMSETUP_PROG resume flakey-test
- [ $? -ne 0 ] && _fatal "failed to resumeflakey-test"
+ [ $? -ne 0 ] && _fatal "failed to resume flakey-test"
}
# Silently drop all writes and unmount/remount to simulate a crash/power
dm-flakey can be used to emulate IO write error, however, when we also need to prevent the IO error for a specific range of the block device (eg., the log region of a XFS), we need to specify multiple dm targets for the dm device. Option --table can not accommodate the multiple dm targets case, so let dmsetup get the possible-multiple-targets table from standard input. Signed-off-by: Hou Tao <houtao1@huawei.com> --- v4: add comments for reading dm target table from standard input --- common/dmflakey | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)