tree df274847cbd18b73bf45dde17dd17dd6a1e18a9b
parent 4dae76705fc8f9854bb732f9944e7ff9ba7a8e9f
author Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 1331744640 -0400
committer Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> 1332597876 -0400

xen/blkback: Make optional features be really optional.

They were using the xenbus_dev_fatal() function which would
change the state of the connection immediately. Which is not
what we want when we advertise optional features.

So make 'feature-discard','feature-barrier','feature-flush-cache'
optional.

Suggested-by: Jan Beulich <JBeulich@suse.com>
[v1: Made the discard function void and static]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>