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    SubjectRe: [Ext2-devel] [RFC 0/13] extents and 48bit ext3
    On Fri, 9 Jun 2006 09:25:57 -0700 (PDT)
    Linus Torvalds <torvalds@osdl.org> wrote:

    > (buffer heads! In 2006!)

    We should be able to make the vast majority of those go away, btw.

    We already have `-o data=writeback,nobh'. That gives us writeback-mode
    with no buffer_heads on the pagecache.

    On top of that we can implement nobh ordered-mode by adding an inode walk
    which calls do_sync_file_range() into the appropriate place in commit.

    The tricky part is the inode walk - at present super_block.s_list is a
    list_head and it's not trivial to walk that without missing some inodes.

    Probably it could be done via a new fs-private dirty-inode list which we
    hande carefully, or via a walk of an i_ino-ordered radix-tree, which
    doesn't miss things.

    I floated this a year or so ago, but no little fishies bit.
    -
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