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    SubjectRe: [PATCH] Only use MSDOS-Partitions by default on X86
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    On Tue, 2003-05-06 at 19:49, Jens Axboe wrote:
    > I see, that would indeed be a bigger job :). Just the block layer would
    > not be hard, especially if you make the restriction that the block
    > drivers usable would be ones that used a make_request strategy for
    > handling requests. That would allow you to kill ll_rw_blk.c,
    > deadline-iosched.c, and elevator.c. That's some 21k of text and 2k of
    > data on this box.

    That's a little short of what I was intending. Ideally we stick 'struct
    request', 'struct buffer_head' and 'struct bio' inside #ifdef
    CONFIG_BLK_DEV, then kill all the dead code which uses them.

    block_dev.c becomes...

    int blkdev_open(struct inode * inode, struct file * filp)
    {
    return -ENXIO;
    }

    Don't look at JFFS; that still needs to be able to open a block device
    even though it never actually _uses_ it. Look at the non-blkdev mount
    path for JFFS2 instead. The _only_ thing we use the mtdblock device for
    is to look at its minor number and use it to pick the right MTD device
    -- it used to give us the locking on simultaneous mounts for free, a
    constant device number for NFS exporting, and a cheap way to work around
    the bug that the 'root=' command line option isn't available to
    filesystems directly.

    mtdblock.c cleanup noted with interest -- I'll play with that shortly;
    thanks. Note that you don't actually need flash hardware, you can load
    the 'mtdram' device which fakes it with vmalloc-backed storage instead.
    Not too useful for powerfail-testing but for mounting something like
    ext2 on mtdblock on mtdram it's fine.

    --
    dwmw2


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