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?
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
--
2.5.0
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