Re: restore splice and sendfile support on kernfs

[Robert Karszniewicz]

On 1/20/21 9:46 PM, Christoph Hellwig wrote:
> Hi Greg and Tejun,
> 
> this fixes a regression in Linux 5.10 that stopped sendfile and splice
> from working on kernfs/sysfs files.
> 
> Diffstt:
>  file.c |   65 ++++++++++++++++++++++++-----------------------------------------
>  1 file changed, 24 insertions(+), 41 deletions(-)
> 

Tested-by: Robert Karszniewicz <r.karszniewicz@xxxxxxxxx>

Confirm that it fixes firmwared for me.

Also, I am 100% sure that the commit that actually breaks firmwared for me is
4d03e3cc5982 ("fs: don't allow kernel reads and writes without iter ops")
which is one commit right before
36e2c7421f02 ("fs: don't allow splice read/write without explicit ops")
. I just verified it again.

Thank you,
Robert