tree 47b12f217a59842f4b5e25bca6b4ab038b10dbc0
parent 4bd6a7353ee14697fea645e941354976d2c4a452
author Christoph Hellwig <hch@lst.de> 1599142953 +0200
committer Al Viro <viro@zeniv.linux.org.uk> 1599618091 -0400

fs: don't allow kernel reads and writes without iter ops

Don't allow calling ->read or ->write with set_fs as a preparation for
killing off set_fs.  All the instances that we use kernel_read/write on
are using the iter ops already.

If a file has both the regular ->read/->write methods and the iter
variants those could have different semantics for messed up enough
drivers.  Also fails the kernel access to them in that case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>