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FFS write coalescing

I could find out myself by digging through the source, but probabely someone
here knows the answer off his head:
When FFS does write coalescing, will it try to align the resulting 64k chunk?
I.e., if I have 32k blocks and I write blocks 1, 2, 3, 4; will it write (1,2)
and (3,4) or 1, (2,3) and 4?
Of course, the background for my question is RAID stripe alignment.

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