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iov_iter: lift dealing with maxpages out of first_{iovec,bvec}_segment()

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caller can do that just as easily

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2022-06-10 20:53:17 -04:00
parent 7392ed1734
commit 599a0bdd72
1 changed files with 10 additions and 10 deletions
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20
lib/iov_iter.c
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@ -1295,7 +1295,7 @@ static ssize_t iter_xarray_get_pages(struct iov_iter *i,
/* must be done on non-empty 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;
@ -1309,8 +1309,6 @@ static unsigned long first_iovec_segment(const struct iov_iter *i,
if (len > maxsize)
len = maxsize;
len += (*start = addr % PAGE_SIZE);
if (len > maxpages * PAGE_SIZE)
len = maxpages * PAGE_SIZE;
*size = len;
return addr & PAGE_MASK;
}
@ -1320,7 +1318,7 @@ 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;
@ -1331,8 +1329,6 @@ 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;
}
@ -1360,7 +1356,9 @@ ssize_t iov_iter_get_pages(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);
res = get_user_pages_fast(addr, n, gup_flags, pages);
if (unlikely(res <= 0))
@ -1370,7 +1368,9 @@ ssize_t iov_iter_get_pages(struct iov_iter *i,
if (iov_iter_is_bvec(i)) {
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);
while (n--)
get_page(*pages++ = page++);
@ -1488,7 +1488,7 @@ 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, ~0U);
addr = first_iovec_segment(i, &len, start, maxsize);
n = DIV_ROUND_UP(len, PAGE_SIZE);
p = get_pages_array(n);
if (!p)
@ -1505,7 +1505,7 @@ ssize_t iov_iter_get_pages_alloc(struct iov_iter *i,
if (iov_iter_is_bvec(i)) {
struct page *page;
page = first_bvec_segment(i, &len, start, maxsize, ~0U);
page = first_bvec_segment(i, &len, start, maxsize);
n = DIV_ROUND_UP(len, PAGE_SIZE);
*pages = p = get_pages_array(n);
if (!p)