[PATCH 18/31] iov_iter: lift dealing with maxpages out of first_{iovec,bvec}_segment()

[Al Viro <viro@xxxxxxxxxxxxxxxxxx>]

Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
 lib/iov_iter.c | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 04c3a62679f8..8f1d63295f37 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1308,12 +1308,9 @@ static ssize_t iter_xarray_get_pages(struct iov_iter *i,
 
 static unsigned long found_ubuf_segment(unsigned long addr,
 					size_t len,
-					size_t *size, size_t *start,
-					unsigned maxpages)
+					size_t *size, size_t *start)
 {
 	len += (*start = addr % PAGE_SIZE);
-	if (len > maxpages * PAGE_SIZE)
-		len = maxpages * PAGE_SIZE;
 	*size = len;
 	return addr & PAGE_MASK;
 }
@@ -1321,14 +1318,14 @@ static unsigned long found_ubuf_segment(unsigned long addr,
 /* must be done on non-empty ITER_UBUF or ITER_IOVEC one */
 static unsigned long first_iovec_segment(const struct iov_iter *i,
 					 size_t *size, size_t *start,
-					 size_t maxsize, unsigned maxpages)
+					 size_t maxsize)
 {
 	size_t skip;
 	long k;
 
 	if (iter_is_ubuf(i)) {
 		unsigned long addr = (unsigned long)i->ubuf + i->iov_offset;
-		return found_ubuf_segment(addr, maxsize, size, start, maxpages);
+		return found_ubuf_segment(addr, maxsize, size, start);
 	}
 
 	for (k = 0, skip = i->iov_offset; k < i->nr_segs; k++, skip = 0) {
@@ -1339,7 +1336,7 @@ static unsigned long first_iovec_segment(const struct iov_iter *i,
 			continue;
 		if (len > maxsize)
 			len = maxsize;
-		return found_ubuf_segment(addr, len, size, start, maxpages);
+		return found_ubuf_segment(addr, len, size, start);
 	}
 	BUG(); // if it had been empty, we wouldn't get called
 }
@@ -1347,7 +1344,7 @@ static unsigned long first_iovec_segment(const struct iov_iter *i,
 /* must be done on non-empty ITER_BVEC one */
 static struct page *first_bvec_segment(const struct iov_iter *i,
 				       size_t *size, size_t *start,
-				       size_t maxsize, unsigned maxpages)
+				       size_t maxsize)
 {
 	struct page *page;
 	size_t skip = i->iov_offset, len;
@@ -1358,8 +1355,6 @@ static struct page *first_bvec_segment(const struct iov_iter *i,
 	skip += i->bvec->bv_offset;
 	page = i->bvec->bv_page + skip / PAGE_SIZE;
 	len += (*start = skip % PAGE_SIZE);
-	if (len > maxpages * PAGE_SIZE)
-		len = maxpages * PAGE_SIZE;
 	*size = len;
 	return page;
 }
@@ -1387,7 +1382,9 @@ static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i,
 		if (i->nofault)
 			gup_flags |= FOLL_NOFAULT;
 
-		addr = first_iovec_segment(i, &len, start, maxsize, maxpages);
+		addr = first_iovec_segment(i, &len, start, maxsize);
+		if (len > maxpages * PAGE_SIZE)
+			len = maxpages * PAGE_SIZE;
 		n = DIV_ROUND_UP(len, PAGE_SIZE);
 		if (*pages) {
 			*pages = get_pages_array(n);
@@ -1405,7 +1402,9 @@ static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i,
 		struct page **p;
 		struct page *page;
 
-		page = first_bvec_segment(i, &len, start, maxsize, maxpages);
+		page = first_bvec_segment(i, &len, start, maxsize);
+		if (len > maxpages * PAGE_SIZE)
+			len = maxpages * PAGE_SIZE;
 		n = DIV_ROUND_UP(len, PAGE_SIZE);
 		p = *pages;
 		if (!p) {
-- 
2.30.2