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    SubjectRe: [Patch 15/18] fs/logfs/super.c
    On Sun, 10 June 2007 20:33:05 +0200, Arnd Bergmann wrote:
    > Then maybe the submit_bio logic should only be done for the ->write
    > path, not for ->read. The data that gets written out should already
    > be present in the page cache for the files, so there is not much point
    > having again, while you can see the read path as blockdev readahead:
    > When you read a physical block that contains a logical block, it's
    > likely to also contain part of another logical block that is going
    > to be read in the near future.

    Makes a lot of sense, yes.

    > This way, you would also get exclusively clean pages in the block
    > device address_space, which can be easily discarded.
    > Also, maintaining correct ordering between write requests can be
    > done easier if you insert the bios directly, instead of waiting
    > for the lru writeback.

    s/easier/only/ ?

    I don't think logfs on block devices makes too much sense yet, so my
    personal priority for this is low. Still, an obvious improvement.


    -- more straw can't possibly matter...
    -- Kirby Bakken
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