Messages in this thread | | | From | "Peter T. Breuer" <> | Subject | Re: O_DIRECT | Date | Thu, 29 Aug 2002 14:14:55 +0200 (MET DST) |
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"A month of sundays ago kernel@street-vision.com wrote:" > > > > What functions does a block driver have to implement in order to > > support read/write when it has been opened with O_DIRECT from user > > space.
> Remeber that the memory you read/write from must be page aligned (ie > mmap /dev/zero not malloc) and reads and writes must be multiples of the > page size. I think block devices work on 2.4 too, but I forget (otherwise > you can use raw devices).
I do believe you are right. Multiples of 4096 seem to work fine. No support needed in the block device driver.
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