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new helper: copy_to_iter_full()

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... and convert copy_linear_skb() to using that.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2024-04-07 02:42:36 -04:00
parent 39cd87c4eb
commit e82051193a
2 changed files with 11 additions and 8 deletions
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10
include/linux/uio.h
View file

@ -205,6 +205,16 @@ size_t copy_from_iter(void *addr, size_t bytes, struct iov_iter *i)
return 0;
}
static __always_inline __must_check
bool copy_to_iter_full(const void *addr, size_t bytes, struct iov_iter *i)
{
size_t copied = copy_to_iter(addr, bytes, i);
if (likely(copied == bytes))
return true;
iov_iter_revert(i, copied);
return false;
}
static __always_inline __must_check
bool copy_from_iter_full(void *addr, size_t bytes, struct iov_iter *i)
{

9
include/net/udp.h
View file

@ -379,14 +379,7 @@ static inline bool udp_skb_is_linear(struct sk_buff *skb)
static inline int copy_linear_skb(struct sk_buff *skb, int len, int off,
struct iov_iter *to)
{
int n;
n = copy_to_iter(skb->data + off, len, to);
if (n == len)
return 0;
iov_iter_revert(to, n);
return -EFAULT;
return copy_to_iter_full(skb->data + off, len, to) ? 0 : -EFAULT;
}
/*