Hi all

Could I please get a code review for the following CR:

7070697 size element for zvols should be optional

Webrev :

https://cr.opensolaris.org/action/browse/caiman/nirmal27/7070697-4/webrev/

Fix :
--> new value "max" for zvol size attribute introduced which will
    create zvol with  90% of the free space in the pool.
--> "max" value is allowed only for "swap" zvols.
--> We cannot have multiple zvols with "max" value in the same pool.


slim_test result
----------------
/net/indiana-build.us.oracle.com//export/home/na210770/ai/7070697/slim-test

Source is pep8 clean.

Testing :
I have done following tests with custom image :

1) Zvol with "max" value . It succeeds.
2) 2 Zvol with "max" value  in the same pool. It fails.
3) Zvol with "max" value and  not defined as "swap" . It fails.
4) 2 Zvol with "max" size subelement in different pools. It succeeds.

Also added new unit tests to verify zvol creation with "max" value.

Thanks
Nirmal
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