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SubjectRe: set blksize of block device
> >> I am learning block device drivers and have a newbie question. Given 
> >> a block device, is there anyway that I could set its block size? For
> >> example, I want to write a block device driver that will work on an
> >> existing block device. In this driver, I want block size smaller.
> >> (The idea looks confusing but I could explain if anybody is
> >> interested :- ) However, typically the block size is 1KB, now I
> >> want to set it to 512 or 256. Can I do it?

256 - no way if hardware can do only 512-byte writes.

You need read-modify-write for this.

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