Messages in this thread | | | Date | Mon, 24 Jan 2000 04:36:18 -0500 (EST) | From | Alexander Viro <> | Subject | Re: Proposal for kernel change |
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On Sun, 23 Jan 2000, Alan Cox wrote:
> > problem. Normal sys_read() and sys_write() would pass copy_to_user() / > > copy_from_user() here. For sys_readv() and sys_writev() - well, > > corresponding function that would copy to/from iovector. IIRC we have > > something like that either in net/core/* or in net/socket.c... > > read and write sometimes lock and DMA from user pages in new driver toys > using Stephen's rawio and kiovec stuff. You would need to be careful how > you arranged it to avoid shooting yourself in the foot on future optimisations
Ouch... And what happens if we do write() _not_ from user page? I can't think of a place that would write to character device from kernel space, but...
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