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Partial buffer_head acquisition
Sorry for the dumb question, but I'm sleepy right now. If you have your
superblock set at 4 KiB blocks and a device is natively 512 B blocks,
let's say, it would be possible to have a partial 4 KiB block at the end
of the device if the device size doesn't happen to be a multiple of the
larger block size. Am I right in assuming the size of the partial block is
stored in buffer_head -> b_size ? And that it correctly reads the partial
block and stores it without problem?
(And on a side note, is buffer_head -> b_blocknr measured with the working
block size or with the hardsect size?
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