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    SubjectRe: per BDI dirty limit (was Re: -mm merge plans for 2.6.24)
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    Date
    > Subject: bdi: debugfs interface
    >
    > Expose the BDI stats (and readahead window) in /debug/bdi/
    >
    > I'm still thinking it should go into /sys somewhere, however I just noticed
    > not all block devices that have a queue have a /queue directory. Noticeably
    > those that use make_request_fn() as opposed to request_fn(). And then of
    > course there are the non-block/non-queue BDIs.
    >
    > A BDI is basically the object that represents the 'thing' you dirty pages
    > against. For block devices that is related to the block device (and is
    > typically embedded in the queue object), for NFS mounts its the remote server
    > object of the client. For FUSE, yet again something else.
    >
    > I appreciate the sysfs people their opinion that /sys/bdi/ might not be the
    > best from their POV, however I'm not seeing where to hook the BDI object from
    > so that it all makes sense, a few of the things are currently not exposed in
    > sysfs at all, like the NFS and FUSE things.
    >
    > So, for now, I've exposed the thing in debugfs. Please suggest a better
    > alternative.
    >
    > Miklos, Trond: could you suggest a better fmt for the bdi_init_fmt() for your
    > respective filesystems?

    For fuse:

    err = bdi_init_fmt(&fc->bdi, "fuse-%llu", (unsigned long long) fc->id);

    This would match the connection ID in /sys/fs/fuse/connections/*

    Miklos
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