Re: [PATCHSET v3.1 0/7] data integrity: Stabilize pages during writeback for various fses

[OGAWA Hirofumi]

Christoph Hellwig <hch@xxxxxxxxxxxxx> writes:

> On Tue, May 10, 2011 at 10:59:15AM +0900, OGAWA Hirofumi wrote:
>> I'd like to know those patches are on what state. Waiting in writeback
>> page makes slower, like you mentioned it (I guess it would more
>> noticeable if device was slower that like FAT uses). And I think
>> currently it doesn't help anything others for blk-integrity stuff
>> (without other technic, it doesn't help FS consistency)?
>
> It only makes things slower if we rewrite a region in a file that is
> currently undergoing writeback. I'd be interested to know about real
> life applications doing that, and if they really are badly affect we
> should help them to work around that in userspace, e.g. by adding a
> fadvice will rewrite call that might be used to never write back that
> regions without an explicit fsync call.

Isn't it reallocated blocks too, and metadata too?

Thanks.
-- 
OGAWA Hirofumi <hirofumi@xxxxxxxxxxxxxxxxxx>
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