Hi Jens, Christoph, Al,
Here are two patches to add some kunit tests for the iov_iter stuff and a patch to fix a couple of bugs found by these tests.
It's by no means comprehensive, but it does at least test the basic copy_to_iter(), copy_from_iter() and iov_iter_extract_pages() for ITER_KVEC, ITER_BVEC and ITER_XARRAY.
I've left ITER_UBUF and ITER_IOVEC untested for now as they require userspace VM interaction and I'm not sure if that's possible under kunit tests. I've also left ITER_DISCARD for the moment as that does nothing and can't be extracted.
The kunit tests should also perhaps be using folios rather than pages, but for the moment I'm using pages because I'm using vmap() and also iov_iter_extract_pages() doesn't yet have a folio equivalent.
I've pushed the patches here also:
https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h...
David
David Howells (3): iov_iter: Fix iov_iter_extract_pages() iov_iter: Kunit tests for copying to/from an iterator iov_iter: Kunit tests for page extraction
lib/Kconfig.debug | 11 + lib/Makefile | 1 + lib/iov_iter.c | 30 +- lib/kunit_iov_iter.c | 777 +++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 804 insertions(+), 15 deletions(-) create mode 100644 lib/kunit_iov_iter.c