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Message-ID: <20230914221526.3153402-7-dhowells@redhat.com> Date: Thu, 14 Sep 2023 23:15:23 +0100 From: David Howells <dhowells@...hat.com> To: Al Viro <viro@...iv.linux.org.uk>, Linus Torvalds <torvalds@...ux-foundation.org> Cc: David Howells <dhowells@...hat.com>, Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>, Christian Brauner <christian@...uner.io>, David Laight <David.Laight@...LAB.COM>, Matthew Wilcox <willy@...radead.org>, Brendan Higgins <brendanhiggins@...gle.com>, David Gow <davidgow@...gle.com>, linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org, linux-mm@...ck.org, netdev@...r.kernel.org, linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com, linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, Christian Brauner <brauner@...nel.org>, David Hildenbrand <david@...hat.com>, John Hubbard <jhubbard@...dia.com> Subject: [RFC PATCH 6/9] iov_iter: Add copy kunit tests for ITER_UBUF and ITER_IOVEC Add copy kunit tests for ITER_UBUF- and ITER_IOVEC-type iterators. This attaches a userspace VM with a mapped file in it temporarily to the test thread. Signed-off-by: David Howells <dhowells@...hat.com> cc: Andrew Morton <akpm@...ux-foundation.org> cc: Christoph Hellwig <hch@....de> cc: Christian Brauner <brauner@...nel.org> cc: Jens Axboe <axboe@...nel.dk> cc: Al Viro <viro@...iv.linux.org.uk> cc: Matthew Wilcox <willy@...radead.org> cc: David Hildenbrand <david@...hat.com> cc: John Hubbard <jhubbard@...dia.com> cc: Brendan Higgins <brendanhiggins@...gle.com> cc: David Gow <davidgow@...gle.com> cc: linux-mm@...ck.org cc: linux-fsdevel@...r.kernel.org cc: linux-kselftest@...r.kernel.org cc: kunit-dev@...glegroups.com --- lib/kunit_iov_iter.c | 200 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 200 insertions(+) diff --git a/lib/kunit_iov_iter.c b/lib/kunit_iov_iter.c index 3353bca9c40f..78f566ebd4a6 100644 --- a/lib/kunit_iov_iter.c +++ b/lib/kunit_iov_iter.c @@ -309,6 +309,202 @@ static u8 __user *__init iov_kunit_create_user_buf(struct kunit *test, return buffer; } +/* + * Test copying to an ITER_UBUF-type iterator. + */ +static void __init iov_kunit_copy_to_ubuf(struct kunit *test) +{ + const struct iov_kunit_range *pr; + struct iov_iter iter; + struct page **spages; + u8 __user *buffer; + u8 *scratch; + ssize_t uncleared; + size_t bufsize, npages, size, copied; + int i; + + bufsize = 0x100000; + npages = bufsize / PAGE_SIZE; + + scratch = iov_kunit_create_buffer(test, &spages, npages); + for (i = 0; i < bufsize; i++) + scratch[i] = pattern(i); + + buffer = iov_kunit_create_user_buf(test, npages, NULL); + uncleared = clear_user(buffer, bufsize); + KUNIT_EXPECT_EQ(test, uncleared, 0); + if (uncleared) + return; + + i = 0; + for (pr = kvec_test_ranges; pr->page >= 0; pr++) { + size = pr->to - pr->from; + KUNIT_ASSERT_LE(test, pr->to, bufsize); + + iov_iter_ubuf(&iter, ITER_DEST, buffer + pr->from, size); + copied = copy_to_iter(scratch + i, size, &iter); + + KUNIT_EXPECT_EQ(test, copied, size); + KUNIT_EXPECT_EQ(test, iter.count, 0); + KUNIT_EXPECT_EQ(test, iter.iov_offset, size); + if (test->status == KUNIT_FAILURE) + break; + i += size; + } + + iov_kunit_build_to_reference_pattern(test, scratch, bufsize, kvec_test_ranges); + iov_kunit_check_user_pattern(test, buffer, scratch, bufsize); + KUNIT_SUCCEED(); +} + +/* + * Test copying from an ITER_UBUF-type iterator. + */ +static void __init iov_kunit_copy_from_ubuf(struct kunit *test) +{ + const struct iov_kunit_range *pr; + struct iov_iter iter; + struct page **spages; + u8 __user *buffer; + u8 *scratch, *reference; + size_t bufsize, npages, size, copied; + int i; + + bufsize = 0x100000; + npages = bufsize / PAGE_SIZE; + + buffer = iov_kunit_create_user_buf(test, npages, NULL); + iov_kunit_fill_user_buf(test, buffer, bufsize); + + scratch = iov_kunit_create_buffer(test, &spages, npages); + memset(scratch, 0, bufsize); + + reference = iov_kunit_create_buffer(test, &spages, npages); + + i = 0; + for (pr = kvec_test_ranges; pr->page >= 0; pr++) { + size = pr->to - pr->from; + KUNIT_ASSERT_LE(test, pr->to, bufsize); + + iov_iter_ubuf(&iter, ITER_SOURCE, buffer + pr->from, size); + copied = copy_from_iter(scratch + i, size, &iter); + + KUNIT_EXPECT_EQ(test, copied, size); + KUNIT_EXPECT_EQ(test, iter.count, 0); + KUNIT_EXPECT_EQ(test, iter.iov_offset, size); + if (test->status == KUNIT_FAILURE) + break; + i += size; + } + + iov_kunit_build_from_reference_pattern(test, reference, bufsize, kvec_test_ranges); + iov_kunit_check_pattern(test, scratch, reference, bufsize); + KUNIT_SUCCEED(); +} + +static void __init iov_kunit_load_iovec(struct kunit *test, + struct iov_iter *iter, int dir, + struct iovec *iov, unsigned int iovmax, + u8 __user *buffer, size_t bufsize, + const struct iov_kunit_range *pr) +{ + size_t size = 0; + int i; + + for (i = 0; i < iovmax; i++, pr++) { + if (pr->page < 0) + break; + KUNIT_ASSERT_GE(test, pr->to, pr->from); + KUNIT_ASSERT_LE(test, pr->to, bufsize); + iov[i].iov_base = buffer + pr->from; + iov[i].iov_len = pr->to - pr->from; + size += pr->to - pr->from; + } + KUNIT_ASSERT_LE(test, size, bufsize); + + iov_iter_init(iter, dir, iov, i, size); +} + +/* + * Test copying to an ITER_IOVEC-type iterator. + */ +static void __init iov_kunit_copy_to_iovec(struct kunit *test) +{ + struct iov_iter iter; + struct page **spages; + struct iovec iov[8]; + u8 __user *buffer; + u8 *scratch; + ssize_t uncleared; + size_t bufsize, npages, size, copied; + int i; + + bufsize = 0x100000; + npages = bufsize / PAGE_SIZE; + + scratch = iov_kunit_create_buffer(test, &spages, npages); + for (i = 0; i < bufsize; i++) + scratch[i] = pattern(i); + + buffer = iov_kunit_create_user_buf(test, npages, NULL); + uncleared = clear_user(buffer, bufsize); + KUNIT_EXPECT_EQ(test, uncleared, 0); + if (uncleared) + return; + + iov_kunit_load_iovec(test, &iter, ITER_DEST, iov, ARRAY_SIZE(iov), + buffer, bufsize, kvec_test_ranges); + size = iter.count; + + copied = copy_to_iter(scratch, size, &iter); + + KUNIT_EXPECT_EQ(test, copied, size); + KUNIT_EXPECT_EQ(test, iter.count, 0); + KUNIT_EXPECT_EQ(test, iter.nr_segs, 0); + + iov_kunit_build_to_reference_pattern(test, scratch, bufsize, kvec_test_ranges); + iov_kunit_check_user_pattern(test, buffer, scratch, bufsize); + KUNIT_SUCCEED(); +} + +/* + * Test copying from an ITER_IOVEC-type iterator. + */ +static void __init iov_kunit_copy_from_iovec(struct kunit *test) +{ + struct iov_iter iter; + struct page **spages; + struct iovec iov[8]; + u8 __user *buffer; + u8 *scratch, *reference; + size_t bufsize, npages, size, copied; + + bufsize = 0x100000; + npages = bufsize / PAGE_SIZE; + + buffer = iov_kunit_create_user_buf(test, npages, NULL); + iov_kunit_fill_user_buf(test, buffer, bufsize); + + scratch = iov_kunit_create_buffer(test, &spages, npages); + memset(scratch, 0, bufsize); + + reference = iov_kunit_create_buffer(test, &spages, npages); + + iov_kunit_load_iovec(test, &iter, ITER_SOURCE, iov, ARRAY_SIZE(iov), + buffer, bufsize, kvec_test_ranges); + size = iter.count; + + copied = copy_from_iter(scratch, size, &iter); + + KUNIT_EXPECT_EQ(test, copied, size); + KUNIT_EXPECT_EQ(test, iter.count, 0); + KUNIT_EXPECT_EQ(test, iter.nr_segs, 0); + + iov_kunit_build_from_reference_pattern(test, reference, bufsize, kvec_test_ranges); + iov_kunit_check_pattern(test, reference, scratch, bufsize); + KUNIT_SUCCEED(); +} + static void __init iov_kunit_load_kvec(struct kunit *test, struct iov_iter *iter, int dir, struct kvec *kvec, unsigned int kvmax, @@ -884,6 +1080,10 @@ static void __init iov_kunit_extract_pages_xarray(struct kunit *test) } static struct kunit_case __refdata iov_kunit_cases[] = { + KUNIT_CASE(iov_kunit_copy_to_ubuf), + KUNIT_CASE(iov_kunit_copy_from_ubuf), + KUNIT_CASE(iov_kunit_copy_to_iovec), + KUNIT_CASE(iov_kunit_copy_from_iovec), KUNIT_CASE(iov_kunit_copy_to_kvec), KUNIT_CASE(iov_kunit_copy_from_kvec), KUNIT_CASE(iov_kunit_copy_to_bvec),
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