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-rw-r--r--lib/iov_iter.c43
1 files changed, 28 insertions, 15 deletions
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index e4dc809d1075..424737045b97 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -566,24 +566,37 @@ size_t iov_iter_zero(size_t bytes, struct iov_iter *i)
}
EXPORT_SYMBOL(iov_iter_zero);
-size_t copy_page_from_iter_atomic(struct page *page, unsigned offset, size_t bytes,
- struct iov_iter *i)
+size_t copy_page_from_iter_atomic(struct page *page, size_t offset,
+ size_t bytes, struct iov_iter *i)
{
- char *kaddr = kmap_atomic(page), *p = kaddr + offset;
- if (!page_copy_sane(page, offset, bytes)) {
- kunmap_atomic(kaddr);
+ size_t n, copied = 0;
+
+ if (!page_copy_sane(page, offset, bytes))
return 0;
- }
- if (WARN_ON_ONCE(!i->data_source)) {
- kunmap_atomic(kaddr);
+ if (WARN_ON_ONCE(!i->data_source))
return 0;
- }
- iterate_and_advance(i, bytes, base, len, off,
- copyin(p + off, base, len),
- memcpy_from_iter(i, p + off, base, len)
- )
- kunmap_atomic(kaddr);
- return bytes;
+
+ do {
+ char *p;
+
+ n = bytes - copied;
+ if (PageHighMem(page)) {
+ page += offset / PAGE_SIZE;
+ offset %= PAGE_SIZE;
+ n = min_t(size_t, n, PAGE_SIZE - offset);
+ }
+
+ p = kmap_atomic(page) + offset;
+ iterate_and_advance(i, n, base, len, off,
+ copyin(p + off, base, len),
+ memcpy_from_iter(i, p + off, base, len)
+ )
+ kunmap_atomic(p);
+ copied += n;
+ offset += n;
+ } while (PageHighMem(page) && copied != bytes && n > 0);
+
+ return copied;
}
EXPORT_SYMBOL(copy_page_from_iter_atomic);