Re: Is it possible for the ext4/btrfs file system to pass some context related info to low level block driver?

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>>>>> "Yunpeng" == Gao, Yunpeng <yunpeng.gao@xxxxxxxxx> writes:

Yunpeng> So, my question is, is there any plan or discussion on
Yunpeng> supporting this feature (passing data type info to low level
Yunpeng> block device driver) on file system developments? Especially
Yunpeng> for ext4/btrfs, since now they are very hot in Linux? Thanks.

Yes, I have been working on some changes that allow us to tag bios and
pass the information out to storage. These patches have been on the back
burner for a while due to other commitments. But I'll dig them out and
post them later. We just discussed them a couple of weeks ago at the
Linux Storage Workshop.

In the meantime: Can you point me to the relevant eMMC stuff so I can
see how many tiers or classes we have to work with there?

-- 
Martin K. Petersen	Oracle Linux Engineering
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