xfstests: test ext4 statfs
Calculating free blocks in ext[234] is surprisingly hard, since
by default we report "bsd" style df which doesn't count filesystem
"overhead" blocks as used.
With a lot of code dedicated to sorting out what to report as
free, things tend to go wrong surprisingly often.
Here's a test to actually try to stop the next regression. ;)
NB: For bsddf, the kernel currently does not count journal blocks
as overhead; it probably should. But the test below looks to have
the result within 1% of perfection, so it still passes even if
the kernel doesn't count the journal against free blocks.
Eric,
This patch has been committed to git://oss.sgi.com/xfs/cmds/xfstests,
master branch, commit 0b2ab695.
Thanks
--Rich
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