bo_bsize: revert r205860 and take an alternative approch in getblk

In r205860 I missed the fact that there is code that strongly assumes
that devvp bo_bsize is equal to underlying provider's sectorsize.
In those places it is hard to obtain the sectorsize in an alternative
way if devvp bo_bsize is set to something else.
So, I am reverting bo_bsize assigment in g_vfs_open.
Instead, in getblk I use DEV_BSIZE block size for b_offset calculation
if vp is a disk vp as reported by vn_isdisk.  This should coinside with
vp being a devvp.

Reported by:	Mykola Dzham <i@levsha.me>
Tested by:	Mykola Dzham <i@levsha.me>
Pointyhat to:	avg
MFC after:	2 weeks
X-ToDo:		convert bread(devvp) in all fs to use bo_bsize-d blocks

0 files changed, 0 insertions, 0 deletions