On Thu, Mar 25, 2010 at 04:57:27AM +0000, David Holland wrote:
> Well... yes, but I guess I don't understand how the read() in the PR
> would end up trapping in copyin/copyout. Presumably there's a uiomove
> in there somewhere, but I would have thought it wouldn't reach it at
> all if the I/O failed.
>
> I suppose I ought to wade through genfs_getpages in more detail
> sometime...
ubc_alloc()
ubc_uiomove()
uiomove()
copyout_vmspace()
copyout()
*trap*
uvm_fault_internal()
uvm_fault_lower()
uvm_fault_lower_io()
(... I/O ...)
*fail*
(We need nice pictures to show UBC behavior.)
Masao
--
Masao Uebayashi / Tombi Inc. / Tel: +81-90-9141-4635
