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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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