Re: [RFC, PATCH] Extensible AIO interface

[Martin K. Petersen]

>>>>> "Kent" == Kent Overstreet <koverstreet@xxxxxxxxxx> writes:

>> Hmm, careful here.  I think that in DIF/DIX the checksums are
>> per-sector, not per IO, right?  That'd mean that the PAGE_SIZE attr
>> limit in this patch would be magically creating different max IO size
>> limits on different architectures.  That doesn't seem great.

Kent> Not just per sector, Per hardware sector. 

Per logical block (or for some devices less).


Kent> For passing around checksums userspace would have to find out the
Kent> hardware sector size and checksum type/size via a different
Kent> interface,

The relevant information is already exported in sysfs. Including the
format, how many bytes of integrity metadata go with how many bytes of
data, etc.

-- 
Martin K. Petersen	Oracle Linux Engineering
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