Add error check when synchronously updating dir-entries.
Furthermore, add exfat_update_bhs(). It wait for write completion once
instead of sector by sector.
This patch can be split into two also ?
I sent a patch split into 'write multiple sectors at once'
and 'add error check when updating dir-entries'.
The other two patches(2nd & 3rd) are no-changed, so have not been sent.
If you need the other two patches, I will send them.
In that case, please tell me how to write the subject and change-log.
BR
---
Tetsuhiro Kohada <kohada.t2@xxxxxxxxx>
