Messages in this thread |  | | Date | Wed, 7 Feb 2001 01:35:23 +0100 | From | Jens Axboe <> | Subject | Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait |
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On Wed, Feb 07 2001, Stephen C. Tweedie wrote: > > [overhead of 512-byte bhs in the raw IO code is an artificial problem of > > the raw IO code.] > > No, it is a problem of the ll_rw_block interface: buffer_heads need to > be aligned on disk at a multiple of their buffer size. Under the Unix > raw IO interface it is perfectly legal to begin a 128kB IO at offset > 512 bytes into a device.
Submitting buffers to lower layers that are not hw sector aligned can't be supported below ll_rw_blk anyway (they can, but look at the problems this has always created), and I would much rather see stuff like this handled outside of there.
-- Jens Axboe
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