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libceph: use sock_no_sendpage() as a fallback in ceph_tcp_sendpage() 

sock_no_sendpage() makes the code cleaner.

Also, don't set MSG_EOR.  sendpage doesn't act on MSG_EOR on its own,
it just honors the setting from the preceding sendmsg call by looking
at ->eor in tcp_skb_can_collapse_to().

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov 2018-11-16 11:58:19 +01:00
parent 1f6b821aef
commit 3239eb5215
1 changed files with 6 additions and 26 deletions
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32
net/ceph/messenger.c
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@ -560,24 +560,12 @@ static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
return r;
}
static int __ceph_tcp_sendpage(struct socket *sock, struct page *page,
int offset, size_t size, bool more)
{
int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR);
int ret;
ret = kernel_sendpage(sock, page, offset, size, flags);
if (ret == -EAGAIN)
ret = 0;
return ret;
}
static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
int offset, size_t size, bool more)
{
struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
struct bio_vec bvec;
ssize_t (*sendpage)(struct socket *sock, struct page *page,
int offset, size_t size, int flags);
int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : 0);
int ret;
/*
@ -589,19 +577,11 @@ static int ceph_tcp_sendpage(struct socket *sock, struct page *page,
* triggers one of hardened usercopy checks.
*/
if (page_count(page) >= 1 && !PageSlab(page))
return __ceph_tcp_sendpage(sock, page, offset, size, more);
bvec.bv_page = page;
bvec.bv_offset = offset;
bvec.bv_len = size;
if (more)
msg.msg_flags |= MSG_MORE;
sendpage = sock->ops->sendpage;
else
msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
sendpage = sock_no_sendpage;
iov_iter_bvec(&msg.msg_iter, WRITE, &bvec, 1, size);
ret = sock_sendmsg(sock, &msg);
ret = sendpage(sock, page, offset, size, flags);
if (ret == -EAGAIN)
ret = 0;