Messages in this thread | | | Date | Fri, 6 Jun 2008 12:36:17 +0200 | From | Jens Axboe <> | Subject | Re: blk_queue_hardsect_size 520-byte sector |
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On Fri, Jun 06 2008, Alan Cox wrote: > On Fri, 6 Jun 2008 09:54:33 +0200 > Jens Axboe <jens.axboe@oracle.com> wrote: > > > On Thu, Jun 05 2008, Anil kumar wrote: > > > Hi, > > > > > > Can I call blk_queue_hardsect_size in a driver and set it to 520-byte > > > as hardware sector size. How does the kernel and block layers take > > > the request, will it be in multiples of 520-bytes aligned or 512 bytes > > > aligned? > > > > No, Linux only supports power-of-2 hardware block sizes I'm afraid. > > And only some of those - which is why we can't support CP/M disks and > also early smartmedia stuff (128/256 byte/sector)
Right, should've made that clearer - Linux only really supports power-of-2 hw block sizes, where the size is >= 512 and <= PAGE_CACHE_SIZE.
-- Jens Axboe
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