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io_uring: support MSG_WAITALL for IORING_OP_SEND(MSG)

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Like commit 7ba89d2af1 for recv/recvmsg, support MSG_WAITALL for the
send side. If this flag is set and we do a short send, retry for a
stream of seqpacket socket.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2022-04-20 19:21:36 -06:00
parent 970f256edb
commit 4c3c09439c
1 changed files with 29 additions and 7 deletions
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36
fs/io_uring.c
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@ -5235,6 +5235,13 @@ static int io_sync_file_range(struct io_kiocb *req, unsigned int issue_flags)
}
#if defined(CONFIG_NET)
static bool io_net_retry(struct socket *sock, int flags)
{
if (!(flags & MSG_WAITALL))
return false;
return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET;
}
static int io_setup_async_msg(struct io_kiocb *req,
struct io_async_msghdr *kmsg)
{
@ -5293,12 +5300,14 @@ static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
if (req->ctx->compat)
sr->msg_flags |= MSG_CMSG_COMPAT;
#endif
sr->done_io = 0;
return 0;
}
static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_async_msghdr iomsg, *kmsg;
struct io_sr_msg *sr = &req->sr_msg;
struct socket *sock;
unsigned flags;
int min_ret = 0;
@ -5330,12 +5339,21 @@ static int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
return io_setup_async_msg(req, kmsg);
if (ret == -ERESTARTSYS)
ret = -EINTR;
if (ret > 0 && io_net_retry(sock, flags)) {
sr->done_io += ret;
req->flags |= REQ_F_PARTIAL_IO;
return io_setup_async_msg(req, kmsg);
}
req_set_fail(req);
}
/* fast path, check for non-NULL to avoid function call */
if (kmsg->free_iov)
kfree(kmsg->free_iov);
req->flags &= ~REQ_F_NEED_CLEANUP;
if (ret >= 0)
ret += sr->done_io;
else if (sr->done_io)
ret = sr->done_io;
__io_req_complete(req, issue_flags, ret, 0);
return 0;
}
@ -5376,8 +5394,19 @@ static int io_send(struct io_kiocb *req, unsigned int issue_flags)
return -EAGAIN;
if (ret == -ERESTARTSYS)
ret = -EINTR;
if (ret > 0 && io_net_retry(sock, flags)) {
sr->len -= ret;
sr->buf += ret;
sr->done_io += ret;
req->flags |= REQ_F_PARTIAL_IO;
return -EAGAIN;
}
req_set_fail(req);
}
if (ret >= 0)
ret += sr->done_io;
else if (sr->done_io)
ret = sr->done_io;
__io_req_complete(req, issue_flags, ret, 0);
return 0;
}
@ -5509,13 +5538,6 @@ static int io_recvmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
return 0;
}
static bool io_net_retry(struct socket *sock, int flags)
{
if (!(flags & MSG_WAITALL))
return false;
return sock->type == SOCK_STREAM || sock->type == SOCK_SEQPACKET;
}
static int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_async_msghdr iomsg, *kmsg;