add another RT growfs test

Christoph Hellwig <[email protected]>
Newsgroups org.kernel.vger.fstests,org.kernel.vger.linux-xfs
Message-ID <[email protected]> 
Hi all,

this adds a test that actually tries to use the newly added space
after a RT growfs, and reproduces the currently terminally broken
zoned growfs.  It includes a special check for zoned file systems,
so that it does not hang on unfixed kernels with zoned RT devices.
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