tree d66d10a4ed03f325194a595a7b6e87d8c0f21206
parent 6de88d72927dc85297b3075024487313c4ba3a2e
author Al Viro <viro@zeniv.linux.org.uk> 1249768732 +0400
committer Al Viro <viro@zeniv.linux.org.uk> 1260983804 -0500

fix the crap in dst/dcore

* don't reinvent the wheels, please - open_bdev_exclusive() is there
  for purpose
* both open_by_devnum() and open_bdev_exclusive() return ERR_PTR(...)
  upon error, not NULL

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>