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@suse.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Tested-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
# 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
# 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