tree fe0b38a554197181de1f019a14893c83201d7bb1
parent 3ae3d67ba705c754a3c91ac009f9ce73a0e7286a
author Vishal Verma <vishal.l.verma@intel.com> 1494450091 -0600
committer Dan Williams <dan.j.williams@intel.com> 1494477982 -0700

libnvdimm, btt: ensure that initializing metadata clears poison

If we had badblocks/poison in the metadata area of a BTT, recreating the
BTT would not clear the poison in all cases, notably the flog area. This
is because rw_bytes will only clear errors if the request being sent
down is 512B aligned and sized.

Make sure that when writing the map and info blocks, the rw_bytes being
sent are of the correct size/alignment. For the flog, instead of doing
the smaller log_entry writes only, first do a 'wipe' of the entire area
by writing zeroes in large enough chunks so that errors get cleared.

Cc: Andy Rudoff <andy.rudoff@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>