fallocate vs O_(D)SYNC

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

It seems all filesystems but XFS ignore O_SYNC for fallocate, and never
make sure the size update transaction made it to disk.

Given that a fallocate without FALLOC_FL_KEEP_SIZE very much is a data
operation (it adds new blocks that return zeroes) that seems like a
fairly nasty surprise for O_SYNC users.
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