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Date: Wed, 15 Nov 2023 15:49:39 +0000
From: David Howells <dhowells@...hat.com>
To: Christian Brauner <christian@...uner.io>
Cc: David Howells <dhowells@...hat.com>,
	Jens Axboe <axboe@...nel.dk>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christoph Hellwig <hch@....de>,
	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,
	Christian Brauner <brauner@...nel.org>,
	David Hildenbrand <david@...hat.com>,
	John Hubbard <jhubbard@...dia.com>
Subject: [PATCH v3 03/10] iov_iter: Consolidate the test vector struct in the kunit tests

Consolidate the test vector struct in the kunit tests so that the bvec
pattern check helpers can share with the kvec check helpers.

Signed-off-by: David Howells <dhowells@...hat.com>
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: 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-kselftest@...r.kernel.org
cc: kunit-dev@...glegroups.com
cc: linux-mm@...ck.org
cc: linux-fsdevel@...r.kernel.org
---
 lib/kunit_iov_iter.c | 90 ++++++++++++++++++++++++--------------------
 1 file changed, 50 insertions(+), 40 deletions(-)

diff --git a/lib/kunit_iov_iter.c b/lib/kunit_iov_iter.c
index ee586eb652b4..4925ca37cde6 100644
--- a/lib/kunit_iov_iter.c
+++ b/lib/kunit_iov_iter.c
@@ -18,22 +18,46 @@ MODULE_DESCRIPTION("iov_iter testing");
 MODULE_AUTHOR("David Howells <dhowells@...hat.com>");
 MODULE_LICENSE("GPL");
 
-struct kvec_test_range {
+struct iov_kunit_range {
 	int	page, from, to;
 };
 
-static const struct kvec_test_range kvec_test_ranges[] = {
-	{ 0, 0x00002, 0x00002 },
-	{ 0, 0x00027, 0x03000 },
-	{ 0, 0x05193, 0x18794 },
-	{ 0, 0x20000, 0x20000 },
-	{ 0, 0x20000, 0x24000 },
-	{ 0, 0x24000, 0x27001 },
-	{ 0, 0x29000, 0xffffb },
-	{ 0, 0xffffd, 0xffffe },
+/*
+ * Ranges that to use in tests where we have address/offset ranges to play
+ * with (ie. KVEC) or where we have a single blob that we can copy
+ * arbitrary chunks of (ie. XARRAY).
+ */
+static const struct iov_kunit_range kvec_test_ranges[] = {
+	{ 0, 0x00002, 0x00002 }, /* Start with an empty range */
+	{ 0, 0x00027, 0x03000 }, /* Midpage to page end */
+	{ 0, 0x05193, 0x18794 }, /* Midpage to midpage */
+	{ 0, 0x20000, 0x20000 }, /* Empty range in the middle */
+	{ 0, 0x20000, 0x24000 }, /* Page start to page end */
+	{ 0, 0x24000, 0x27001 }, /* Page end to midpage */
+	{ 0, 0x29000, 0xffffb }, /* Page start to midpage */
+	{ 0, 0xffffd, 0xffffe }, /* Almost contig to last, ending in same page */
 	{ -1 }
 };
 
+/*
+ * Ranges that to use in tests where we have a list of partial pages to
+ * play with (ie. BVEC).
+ */
+static const struct iov_kunit_range bvec_test_ranges[] = {
+	{ 0, 0x0002, 0x0002 }, /* Start with an empty range */
+	{ 1, 0x0027, 0x0893 }, /* Random part of page */
+	{ 2, 0x0193, 0x0794 }, /* Random part of page */
+	{ 3, 0x0000, 0x1000 }, /* Full page */
+	{ 4, 0x0000, 0x1000 }, /* Full page logically contig to last */
+	{ 5, 0x0000, 0x1000 }, /* Full page logically contig to last */
+	{ 6, 0x0000, 0x0ffb }, /* Part page logically contig to last */
+	{ 6, 0x0ffd, 0x0ffe }, /* Part of prev page, but not quite contig */
+	{ -1 }
+};
+
+/*
+ * The pattern to fill with.
+ */
 static inline u8 pattern(unsigned long x)
 {
 	return x & 0xff;
@@ -44,6 +68,9 @@ static void iov_kunit_unmap(void *data)
 	vunmap(data);
 }
 
+/*
+ * Create a buffer out of some pages and return a vmap'd pointer to it.
+ */
 static void *__init iov_kunit_create_buffer(struct kunit *test,
 					    struct page ***ppages,
 					    size_t npages)
@@ -75,7 +102,7 @@ static void *__init iov_kunit_create_buffer(struct kunit *test,
  */
 static void iov_kunit_build_to_reference_pattern(struct kunit *test, u8 *scratch,
 						 size_t bufsize,
-						 const struct kvec_test_range *pr)
+						 const struct iov_kunit_range *pr)
 {
 	int i, patt = 0;
 
@@ -91,7 +118,7 @@ static void iov_kunit_build_to_reference_pattern(struct kunit *test, u8 *scratch
  */
 static void iov_kunit_build_from_reference_pattern(struct kunit *test, u8 *buffer,
 						   size_t bufsize,
-						   const struct kvec_test_range *pr)
+						   const struct iov_kunit_range *pr)
 {
 	size_t i = 0, j;
 
@@ -124,7 +151,7 @@ static void __init iov_kunit_load_kvec(struct kunit *test,
 				       struct iov_iter *iter, int dir,
 				       struct kvec *kvec, unsigned int kvmax,
 				       void *buffer, size_t bufsize,
-				       const struct kvec_test_range *pr)
+				       const struct iov_kunit_range *pr)
 {
 	size_t size = 0;
 	int i;
@@ -217,28 +244,12 @@ static void __init iov_kunit_copy_from_kvec(struct kunit *test)
 	KUNIT_SUCCEED();
 }
 
-struct bvec_test_range {
-	int	page, from, to;
-};
-
-static const struct bvec_test_range bvec_test_ranges[] = {
-	{ 0, 0x0002, 0x0002 },
-	{ 1, 0x0027, 0x0893 },
-	{ 2, 0x0193, 0x0794 },
-	{ 3, 0x0000, 0x1000 },
-	{ 4, 0x0000, 0x1000 },
-	{ 5, 0x0000, 0x1000 },
-	{ 6, 0x0000, 0x0ffb },
-	{ 6, 0x0ffd, 0x0ffe },
-	{ -1 }
-};
-
 static void __init iov_kunit_load_bvec(struct kunit *test,
 				       struct iov_iter *iter, int dir,
 				       struct bio_vec *bvec, unsigned int bvmax,
 				       struct page **pages, size_t npages,
 				       size_t bufsize,
-				       const struct bvec_test_range *pr)
+				       const struct iov_kunit_range *pr)
 {
 	struct page *can_merge = NULL, *page;
 	size_t size = 0;
@@ -276,13 +287,13 @@ static void __init iov_kunit_load_bvec(struct kunit *test,
  */
 static void __init iov_kunit_copy_to_bvec(struct kunit *test)
 {
-	const struct bvec_test_range *pr;
+	const struct iov_kunit_range *pr;
 	struct iov_iter iter;
 	struct bio_vec bvec[8];
 	struct page **spages, **bpages;
 	u8 *scratch, *buffer;
 	size_t bufsize, npages, size, copied;
-	int i, b, patt;
+	int i, patt;
 
 	bufsize = 0x100000;
 	npages = bufsize / PAGE_SIZE;
@@ -305,10 +316,9 @@ static void __init iov_kunit_copy_to_bvec(struct kunit *test)
 	KUNIT_EXPECT_EQ(test, iter.nr_segs, 0);
 
 	/* Build the expected image in the scratch buffer. */
-	b = 0;
 	patt = 0;
 	memset(scratch, 0, bufsize);
-	for (pr = bvec_test_ranges; pr->page >= 0; pr++, b++) {
+	for (pr = bvec_test_ranges; pr->page >= 0; pr++) {
 		u8 *p = scratch + pr->page * PAGE_SIZE;
 
 		for (i = pr->from; i < pr->to; i++)
@@ -324,7 +334,7 @@ static void __init iov_kunit_copy_to_bvec(struct kunit *test)
  */
 static void __init iov_kunit_copy_from_bvec(struct kunit *test)
 {
-	const struct bvec_test_range *pr;
+	const struct iov_kunit_range *pr;
 	struct iov_iter iter;
 	struct bio_vec bvec[8];
 	struct page **spages, **bpages;
@@ -411,7 +421,7 @@ static struct xarray *iov_kunit_create_xarray(struct kunit *test)
  */
 static void __init iov_kunit_copy_to_xarray(struct kunit *test)
 {
-	const struct kvec_test_range *pr;
+	const struct iov_kunit_range *pr;
 	struct iov_iter iter;
 	struct xarray *xarray;
 	struct page **spages, **bpages;
@@ -457,7 +467,7 @@ static void __init iov_kunit_copy_to_xarray(struct kunit *test)
  */
 static void __init iov_kunit_copy_from_xarray(struct kunit *test)
 {
-	const struct kvec_test_range *pr;
+	const struct iov_kunit_range *pr;
 	struct iov_iter iter;
 	struct xarray *xarray;
 	struct page **spages, **bpages;
@@ -503,7 +513,7 @@ static void __init iov_kunit_copy_from_xarray(struct kunit *test)
  */
 static void __init iov_kunit_extract_pages_kvec(struct kunit *test)
 {
-	const struct kvec_test_range *pr;
+	const struct iov_kunit_range *pr;
 	struct iov_iter iter;
 	struct page **bpages, *pagelist[8], **pages = pagelist;
 	struct kvec kvec[8];
@@ -583,7 +593,7 @@ static void __init iov_kunit_extract_pages_kvec(struct kunit *test)
  */
 static void __init iov_kunit_extract_pages_bvec(struct kunit *test)
 {
-	const struct bvec_test_range *pr;
+	const struct iov_kunit_range *pr;
 	struct iov_iter iter;
 	struct page **bpages, *pagelist[8], **pages = pagelist;
 	struct bio_vec bvec[8];
@@ -661,7 +671,7 @@ static void __init iov_kunit_extract_pages_bvec(struct kunit *test)
  */
 static void __init iov_kunit_extract_pages_xarray(struct kunit *test)
 {
-	const struct kvec_test_range *pr;
+	const struct iov_kunit_range *pr;
 	struct iov_iter iter;
 	struct xarray *xarray;
 	struct page **bpages, *pagelist[8], **pages = pagelist;


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