The dm-log-writes infrastructure is currently implemented to use
SCRATCH_DEV as a hardcoded data device. In preparation to allow use
of specialized devices in certain circumstances, genericize the code
to allow an arbitrary data device. This requires passing the target
device as a parameter to several helper functions from various
tests. No functional changes.
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
This test creates a file and writes to it via an mmap(), but never
syncs via fsync/msync. This process is tracked via dm-log-writes,
then replayed.
If MAP_SYNC is working the dm-log-writes replay will show the test
file with 1 MiB of on-media block allocations. This is because each
allocating page fault included an implicit metadata sync. If
MAP_SYNC isn't working (which you can test by removing the "-S" flag
to xfs_io mmap) the file will be smaller or missing entirely.
Note that dm-log-writes doesn't track the data that we write via the
mmap(), so we can't do any data integrity checking. We can only
verify that the metadata writes for the page faults happened.
[eguan: add comments on _require_log_writes_dax and fix its cleanup]
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
Brian Foster
Dave Chinner
Ross Zwisler