Re: [PATCH 4/4] block: Optionally snapshot page contents to provide stable pages during write

[OGAWA Hirofumi]

"Darrick J. Wong" <darrick.wong@xxxxxxxxxx> writes:

> On Fri, Dec 28, 2012 at 06:48:35AM +0900, OGAWA Hirofumi wrote:
>> "Darrick J. Wong" <darrick.wong@xxxxxxxxxx> writes:
>> 
>> >> I think this flag should be separated into "FS provide stable page" and
>> >> "FS needs bounce buffer for stable page".
>> >> 
>> >> My fs (I guess btrfs also) provides stable page by better way, and
>> >> doesn't need to wait writeback flags too. What needs is just to avoid
>> >> those stable page stuff.
>> >
>> > How does your fs (are we talking about vfat?) provide stable pages?
>> 
>> Basically it copies the data to another page before modifying data only
>> if page has writeback flag. (this is about new fs under development stage.)
>
> Aha, we're talking about tux3.  Since (afaik) there aren't any other
> filesystems requesting this flag and tux3 uses the device bdi, should I just
> create a patch and send it to you so it'll be included when tux3 goes in?

If core doesn't provide, no need to waste your time. I will.

Thanks.
-- 
OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
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