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

[Petr Rockai]

Hi,

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.

Yours,
   Petr

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