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    SubjectRe: Btrfs for mainline
    On Saturday 03 January 2009 06:38:07 Chris Mason wrote:
    > On Sat, 2009-01-03 at 01:37 +0900, Ryusuke Konishi wrote:
    > > Hi,
    > >
    > > On Wed, 31 Dec 2008 18:19:09 -0500, Chris Mason <>
    > > > This has only btrfs as a module and would be the fastest way to see
    > > > the .c files. btrfs doesn't have any changes outside of fs/Makefile
    > > > and fs/Kconfig
    > [ ... ]
    > > In addition, there seem to be well-separated reusable routines such as
    > > async-thread (enhanced workqueue) and extent_map. Do you intend to
    > > move these into lib/ or so?
    > Sorry, looks like I hit send too soon that time. The async-thread code
    > is very self contained, and was intended for generic use. Pushing that
    > into lib is probably a good idea.
    > The extent_map and extent_buffer code was also intended for generic use.
    > It needs some love and care (making it work for blocksize != pagesize)
    > before I'd suggest moving it out of fs/btrfs.

    I'm yet to be convinced it is a good idea to use extents for this. Been a
    long time since we visited the issue, but when you converted ext2 to use
    the extent mapping stuff, it actually went slower, and complexity went up
    a lot (IIRC possibly required allocations in the writeback path).

    So I think it is a fine idea to live in btrfs until it is more proven and
    found useful elsewhere.

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