Hi Darrick, xfs guys and btrfs guys.
Although such question is quite late as reflink generic tests are in
fstests for a long time, I'm still not sure what's the correct behavior
for reflink len = 0.
Test case generic/182 is causing different output between btrfs and xfs.
For btrfs, dedupe will just return 0 and check nothing, while for xfs
len == 0 means to check the whole file length.
Both makes sense for me, for btrfs len = 0 behavior, it just follows
read/write functions.
And I assume xfs follows reflink behavior, when len is not specified,
then reflink the length of src file.
But since it's a generic test, we need to unify the behavior.
So, which one is the standard and which document should we follow for
such behavior definition?
Thanks,
Qu
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