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unify xarray_get_pages() and xarray_get_pages_alloc()

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same as for pipes

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2022-06-17 13:48:03 -04:00
parent acbdeb8320
commit 68fe506f37
1 changed files with 10 additions and 39 deletions
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49
lib/iov_iter.c
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@ -1373,7 +1373,7 @@ static ssize_t iter_xarray_populate_pages(struct page **pages, struct xarray *xa
}
static ssize_t iter_xarray_get_pages(struct iov_iter *i,
struct page **pages, size_t maxsize,
struct page ***pages, size_t maxsize,
unsigned maxpages, size_t *_start_offset)
{
unsigned nr, offset;
@ -1398,7 +1398,13 @@ static ssize_t iter_xarray_get_pages(struct iov_iter *i,
if (count > maxpages)
count = maxpages;
nr = iter_xarray_populate_pages(pages, i->xarray, index, count);
if (!*pages) {
*pages = get_pages_array(count);
if (!*pages)
return -ENOMEM;
}
nr = iter_xarray_populate_pages(*pages, i->xarray, index, count);
if (nr == 0)
return 0;
@ -1490,46 +1496,11 @@ ssize_t iov_iter_get_pages(struct iov_iter *i,
if (iov_iter_is_pipe(i))
return pipe_get_pages(i, &pages, maxsize, maxpages, start);
if (iov_iter_is_xarray(i))
return iter_xarray_get_pages(i, pages, maxsize, maxpages, start);
return iter_xarray_get_pages(i, &pages, maxsize, maxpages, start);
return -EFAULT;
}
EXPORT_SYMBOL(iov_iter_get_pages);
static ssize_t iter_xarray_get_pages_alloc(struct iov_iter *i,
struct page ***pages, size_t maxsize,
size_t *_start_offset)
{
struct page **p;
unsigned nr, offset;
pgoff_t index, count;
size_t size = maxsize;
loff_t pos;
pos = i->xarray_start + i->iov_offset;
index = pos >> PAGE_SHIFT;
offset = pos & ~PAGE_MASK;
*_start_offset = offset;
count = 1;
if (size > PAGE_SIZE - offset) {
size -= PAGE_SIZE - offset;
count += size >> PAGE_SHIFT;
size &= ~PAGE_MASK;
if (size)
count++;
}
*pages = p = get_pages_array(count);
if (!p)
return -ENOMEM;
nr = iter_xarray_populate_pages(p, i->xarray, index, count);
if (nr == 0)
return 0;
return min_t(size_t, nr * PAGE_SIZE - offset, maxsize);
}
static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i,
struct page ***pages, size_t maxsize,
size_t *start)
@ -1580,7 +1551,7 @@ static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i,
if (iov_iter_is_pipe(i))
return pipe_get_pages(i, pages, maxsize, ~0U, start);
if (iov_iter_is_xarray(i))
return iter_xarray_get_pages_alloc(i, pages, maxsize, start);
return iter_xarray_get_pages(i, pages, maxsize, ~0U, start);
return -EFAULT;
}