Re: about TRIM/DISCARD support and barriers

Hello,

cc'ing Matthew whom I forgot to cc in the first message. Matthew, the
original message is...

http://lkml.org/lkml/2008/11/22/260

Tejun Heo wrote:
Dongjun Shin who works for Samsung SSD dep asked me about libata TRIM
support and pointed me to the new DISCARD support David Woodhouse got
merged for 2.6.28. I took a look at the code and blk-layer
interface-wise we seemed to be ready both for filesystems and userland
(so that fsck or something which runs background can mark unused
blocks) but there doesn't seem to be any low level driver which
actually implements ->prepare_discard_fn or fs which sets the DISCARD
flag.

Dongjun, the only doc I can find about ATA TRIM is the following one.

http://t13.org/Documents/UploadedDocuments/docs2007/e07154r3-Data_Set_Management_Proposal_for_ATA-ACS2.pdf

And AFAICS this hasn't made into ACS yet. Is this what you guys are
gonna implement and Windows7 is gonna use?

Thanks.

--
tejun
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