set blksize of block device

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Hello,

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?

TIA
Lei


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