Re: [PATCH 2/4] Remove readv/writev methods and use aio_read/aio_write instead

[Ian Kent <raven@themaw.net>]

Christoph Hellwig wrote:
> On Sun, May 21, 2006 at 06:00:37PM -0700, Andrew Morton wrote:
>> Badari Pulavarty <pbadari@us.ibm.com> wrote:
>>> This patch removes readv() and writev() methods and replaces
>>>  them with aio_read()/aio_write() methods.
>> And it breaks autofs4
>>
>> autofs: pipe file descriptor does not contain proper ops
> 
> this comes because the autofs4 pipe fd doesn't have a write file
> operations.
> 
> Badari do you remember any place in your patches where you didn't
> add do_sync_write for a file_operations instance?
> 
> Ian, what kind of file is the autofs4 pipe?  is it a named pipe or
> a fifo or a "real" file?

The autofs4 fill_super does an fget on a pipe file handle passed in the 
mount options. It uses the write method of the returned file struct to 
send packets back to the daemon. The fill_super method checks to see if 
there is a write method present in the returned file struct and emits 
this message if it's not found.

Ian