[PATCH] Fix RHBZ 754198 (multiple dmeventd snapshot extensions)

[Milan Broz <mbroz@redhat.com>]

On 11/15/2011 11:00 PM, Petr Rockai wrote:
> the attached patch should fix the problem encountered in 754198. Namely,
> we failed to reset the percent threshold for the next check after
> extending a snapshot. To this end, I have added a special exit code,
> ENO_ACTION_NEEDED -- however, this is not absolutely required, and is
> only an optimisation. On the other hand, it is likely an important
> optimisation, because without this, all snapshots filled above 50 % will
> run a LVM command (with all the associated overhead) every 10
> seconds. There are more possible uses for this new exit code, so I think
> it's a good idea anyway.
> 
> Documentation *might* need updating (although it's currently only used
> by --use-policies, which is not an entirely user-level option...).
> 
> Other than that, the patch is relatively straightforward.

For me this seems ok, ack.
(dmeventd/lvm interaction through calling lvm binary strange anyway...)

Milan