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[iov_iter] new primitives - copy_from_iter_full() and friends

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copy_from_iter_full(), copy_from_iter_full_nocache() and
csum_and_copy_from_iter_full() - counterparts of copy_from_iter()
et.al., advancing iterator only in case of successful full copy
and returning whether it had been successful or not.

Convert some obvious users.  *NOTE* - do not blindly assume that
something is a good candidate for those unless you are sure that
not advancing iov_iter in failure case is the right thing in
this case.  Anything that does short read/short write kind of
stuff (or is in a loop, etc.) is unlikely to be a good one.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-11-01 22:09:04 -04:00
parent e5517c2a5a
commit cbbd26b8b1
17 changed files with 121 additions and 39 deletions
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6
net/bluetooth/l2cap_core.c
View file

@ -2127,7 +2127,7 @@ static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
struct sk_buff **frag;
int sent = 0;
if (copy_from_iter(skb_put(skb, count), count, &msg->msg_iter) != count)
if (!copy_from_iter_full(skb_put(skb, count), count, &msg->msg_iter))
return -EFAULT;
sent += count;
@ -2147,8 +2147,8 @@ static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan,
*frag = tmp;
if (copy_from_iter(skb_put(*frag, count), count,
&msg->msg_iter) != count)
if (!copy_from_iter_full(skb_put(*frag, count), count,
&msg->msg_iter))
return -EFAULT;
sent += count;