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    SubjectRe: [PATCH 4/4] Btrfs: add basic DIO read/write support V3
    On Thu, May 13, 2010 at 11:26:39AM -0400, Christoph Hellwig wrote:
    > On Thu, May 13, 2010 at 11:31:45AM -0400, Josef Bacik wrote:
    > > AIO's aio_complete does kmap with KM_IRQ0/1 and it gets called in the same
    > > context as the btrfs completion handler, so if it's ok for aio_complete it
    > > should be ok for btrfs right? Thanks,
    >
    > aio_complete does a spin_lock_irqsave before that, which disables
    > interrupts on the local CPU.
    >

    Ok how about I just do

    local_irq_disable()
    kmap(KM_IRQ0)
    local_irq_enable()

    would that be acceptable? Thanks,

    Josef


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