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    SubjectRe: bforget and protected buffers
    On Tue, 27 Apr 1999, Chuck Lever wrote:

    >see the buffer_busy macro defined later in fs/buffer.c for use by
    >try_to_free_buffers(). this will prevent protected ramdisk buffers from
    >being reclaimed, although they can still appear on the free list if
    >someone decides to add bforget() calls to the ramdisk logic... presumably
    >if ramdisk decides to bforget a buffer, it doesn't care about it's
    >contents.
    >
    >now, if you add this to bforget():
    >
    > buf->b_state = 0;
    >
    >that defeats the buffer_busy check in try_to_free_buffers(), so maybe the
    >check should be made explicitly in bforget() if you add this line.

    Even if you don't add the buf->b_state = 0 by hand in bforgot, you'll get
    b_state set to 0 by getblk a bit after.

    Andrea Arcangeli



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