tree 129376759401915b665e06c5f65c91fe65c90494
parent 5f7c01249bea67c32a1a1551a8f2fe0b8b801ab4
author Lars Ellenberg <lars.ellenberg@linbit.com> 1433767718 +0200
committer Jens Axboe <axboe@fb.com> 1448468523 -0700

drbd: fix error path during resize

In case the lower level device size changed, but some other internal
details of the resize did not work out, drbd_determine_dev_size() would
try to restore the previous settings, trusting
drbd_md_set_sector_offsets() to "do the right thing", but overlooked
that this internally may set the meta data base offset based on device size.

This could end up with incomplete on-disk meta data layout change, and
ultimately lead to data corruption (if the failure was not noticed or
ignored by the operator, and other things go wrong as well).

Just remember all meta data related offsets/sizes,
and on error restore them all.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@fb.com>