On 16.11.2017 01:47, Liu Bo wrote:
> This changes to use '_scratch_cycle_mount' to drop all caches btrfs could have
> in order to avoid an issue that drop_caches somehow doesn't work on Nikolay's
> box.
>
> Also use bash -c to run 'read' only when %pid is odd so that we can read the
> faulty disk.
>
> Reported-by: Nikolay Borisov <nborisov@xxxxxxxx>
> Signed-off-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
> ---
> v2: Change 'fadvise -d' to _scratch_cycle_mount.
>
> To Nikolay,
>
> I didn't add your tested-by, but could you please verify if this also
> works on your test box?
Just did around 50 runs and didn't fail once. Without it failed on the
second iteration so :
Tested-by: Nikolay Borisov <nborisov@xxxxxxxx>
>
>
> tests/btrfs/143 | 20 ++++++++++----------
> 1 file changed, 10 insertions(+), 10 deletions(-)
>
> diff --git a/tests/btrfs/143 b/tests/btrfs/143
> index da7bfd8..3875b6c 100755
> --- a/tests/btrfs/143
> +++ b/tests/btrfs/143
> @@ -127,16 +127,16 @@ echo "step 3......repair the bad copy" >>$seqres.full
> # since raid1 consists of two copies, and the bad copy was put on stripe #1
> # while the good copy lies on stripe #0, the bad copy only gets access when the
> # reader's pid % 2 == 1 is true
> -while true; do
> - # start_fail only fails the following buffered read so the repair is
> - # supposed to work.
> - echo 3 > /proc/sys/vm/drop_caches
> - start_fail
> - $XFS_IO_PROG -c "pread 0 4K" "$SCRATCH_MNT/foobar" > /dev/null &
> - pid=$!
> - wait
> - stop_fail
> - [ $((pid % 2)) == 1 ] && break
> +while [[ -z ${result} ]]; do
> + # invalidate the page cache.
> + _scratch_cycle_mount
> +
> + start_fail
> + result=$(bash -c "
> + if [[ \$((\$\$ % 2)) -eq 1 ]]; then
> + exec $XFS_IO_PROG -c \"pread 0 4K\" \"$SCRATCH_MNT/foobar\"
> + fi");
> + stop_fail
> done
>
> _scratch_unmount
>
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