Hi,
I have a question regarding speculated preallocation in XFS, w.r.t kernel version: 3.16.0-46-generic.
I am using Swift version: 1.0 and mkfs.xfs version 3.2.1
When I write a 256KiB file to Swift, I see that the underlying XFS uses 3x the amount of space/blocks to write that data.
Upon performing detailed experiments, I see that when Swift uses fallocate (default approach), XFS doesn't reclaim the preallocated blocks that XFS allocated. Swift fallocate doesn't exceed the body size(256 KiB).
Interestingly, when either allocsize=4k or when swift doesn't use fallocate, XFS doesn't consume additional space.
Can you please let me know if this is a known bug and if its fixed in the later versions?
Thanks & Regards,
Dilip
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