From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>, [email protected]
Subject: [PATCH 2/3] io_uring: use more specific type in rcv/snd msg cp
Date: Sun, 12 Jul 2020 20:41:05 +0300 [thread overview]
Message-ID: <14658362164348e66026196832b67932dea8e20e.1594571075.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>
send/recv msghdr initialisation works with struct io_async_msghdr, but
pulls the whole struct io_async_ctx for no reason. That complicates it
with composite accessing, e.g. io->msg.
Use and pass the most specific type, which is struct io_async_msghdr.
It is the larget field in union io_async_ctx and doesn't save stack
space, but looks clearer.
The most of the changes are replacing "io->msg." with "iomsg->"
Signed-off-by: Pavel Begunkov <[email protected]>
---
fs/io_uring.c | 63 +++++++++++++++++++++++++--------------------------
1 file changed, 31 insertions(+), 32 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 2cfcf111f58f..b496aebd6285 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3931,7 +3931,7 @@ static int io_sendmsg(struct io_kiocb *req, bool force_nonblock,
sock = sock_from_file(req->file, &ret);
if (sock) {
- struct io_async_ctx io;
+ struct io_async_msghdr iomsg;
unsigned flags;
if (req->io) {
@@ -3944,14 +3944,13 @@ static int io_sendmsg(struct io_kiocb *req, bool force_nonblock,
} else {
struct io_sr_msg *sr = &req->sr_msg;
- kmsg = &io.msg;
- kmsg->msg.msg_name = &io.msg.addr;
-
- io.msg.iov = io.msg.fast_iov;
- ret = sendmsg_copy_msghdr(&io.msg.msg, sr->umsg,
- sr->msg_flags, &io.msg.iov);
+ iomsg.msg.msg_name = &iomsg.addr;
+ iomsg.iov = iomsg.fast_iov;
+ ret = sendmsg_copy_msghdr(&iomsg.msg, sr->umsg,
+ sr->msg_flags, &iomsg.iov);
if (ret)
return ret;
+ kmsg = &iomsg;
}
flags = req->sr_msg.msg_flags;
@@ -4019,30 +4018,31 @@ static int io_send(struct io_kiocb *req, bool force_nonblock,
return 0;
}
-static int __io_recvmsg_copy_hdr(struct io_kiocb *req, struct io_async_ctx *io)
+static int __io_recvmsg_copy_hdr(struct io_kiocb *req,
+ struct io_async_msghdr *iomsg)
{
struct io_sr_msg *sr = &req->sr_msg;
struct iovec __user *uiov;
size_t iov_len;
int ret;
- ret = __copy_msghdr_from_user(&io->msg.msg, sr->umsg,
- &io->msg.uaddr, &uiov, &iov_len);
+ ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg,
+ &iomsg->uaddr, &uiov, &iov_len);
if (ret)
return ret;
if (req->flags & REQ_F_BUFFER_SELECT) {
if (iov_len > 1)
return -EINVAL;
- if (copy_from_user(io->msg.iov, uiov, sizeof(*uiov)))
+ if (copy_from_user(iomsg->iov, uiov, sizeof(*uiov)))
return -EFAULT;
- sr->len = io->msg.iov[0].iov_len;
- iov_iter_init(&io->msg.msg.msg_iter, READ, io->msg.iov, 1,
+ sr->len = iomsg->iov[0].iov_len;
+ iov_iter_init(&iomsg->msg.msg_iter, READ, iomsg->iov, 1,
sr->len);
- io->msg.iov = NULL;
+ iomsg->iov = NULL;
} else {
ret = import_iovec(READ, uiov, iov_len, UIO_FASTIOV,
- &io->msg.iov, &io->msg.msg.msg_iter);
+ &iomsg->iov, &iomsg->msg.msg_iter);
if (ret > 0)
ret = 0;
}
@@ -4052,7 +4052,7 @@ static int __io_recvmsg_copy_hdr(struct io_kiocb *req, struct io_async_ctx *io)
#ifdef CONFIG_COMPAT
static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req,
- struct io_async_ctx *io)
+ struct io_async_msghdr *iomsg)
{
struct compat_msghdr __user *msg_compat;
struct io_sr_msg *sr = &req->sr_msg;
@@ -4062,7 +4062,7 @@ static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req,
int ret;
msg_compat = (struct compat_msghdr __user *) sr->umsg;
- ret = __get_compat_msghdr(&io->msg.msg, msg_compat, &io->msg.uaddr,
+ ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr,
&ptr, &len);
if (ret)
return ret;
@@ -4079,12 +4079,12 @@ static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req,
return -EFAULT;
if (clen < 0)
return -EINVAL;
- sr->len = io->msg.iov[0].iov_len;
- io->msg.iov = NULL;
+ sr->len = iomsg->iov[0].iov_len;
+ iomsg->iov = NULL;
} else {
ret = compat_import_iovec(READ, uiov, len, UIO_FASTIOV,
- &io->msg.iov,
- &io->msg.msg.msg_iter);
+ &iomsg->iov,
+ &iomsg->msg.msg_iter);
if (ret < 0)
return ret;
}
@@ -4093,17 +4093,18 @@ static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req,
}
#endif
-static int io_recvmsg_copy_hdr(struct io_kiocb *req, struct io_async_ctx *io)
+static int io_recvmsg_copy_hdr(struct io_kiocb *req,
+ struct io_async_msghdr *iomsg)
{
- io->msg.msg.msg_name = &io->msg.addr;
- io->msg.iov = io->msg.fast_iov;
+ iomsg->msg.msg_name = &iomsg->addr;
+ iomsg->iov = iomsg->fast_iov;
#ifdef CONFIG_COMPAT
if (req->ctx->compat)
- return __io_compat_recvmsg_copy_hdr(req, io);
+ return __io_compat_recvmsg_copy_hdr(req, iomsg);
#endif
- return __io_recvmsg_copy_hdr(req, io);
+ return __io_recvmsg_copy_hdr(req, iomsg);
}
static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req,
@@ -4153,7 +4154,7 @@ static int io_recvmsg_prep(struct io_kiocb *req,
if (req->flags & REQ_F_NEED_CLEANUP)
return 0;
- ret = io_recvmsg_copy_hdr(req, io);
+ ret = io_recvmsg_copy_hdr(req, &io->msg);
if (!ret)
req->flags |= REQ_F_NEED_CLEANUP;
return ret;
@@ -4169,7 +4170,7 @@ static int io_recvmsg(struct io_kiocb *req, bool force_nonblock,
sock = sock_from_file(req->file, &ret);
if (sock) {
struct io_buffer *kbuf;
- struct io_async_ctx io;
+ struct io_async_msghdr iomsg;
unsigned flags;
if (req->io) {
@@ -4180,12 +4181,10 @@ static int io_recvmsg(struct io_kiocb *req, bool force_nonblock,
kmsg->iov = kmsg->fast_iov;
kmsg->msg.msg_iter.iov = kmsg->iov;
} else {
- kmsg = &io.msg;
- kmsg->msg.msg_name = &io.msg.addr;
-
- ret = io_recvmsg_copy_hdr(req, &io);
+ ret = io_recvmsg_copy_hdr(req, &iomsg);
if (ret)
return ret;
+ kmsg = &iomsg;
}
kbuf = io_recv_buffer_select(req, &cflags, !force_nonblock);
--
2.24.0
next prev parent reply other threads:[~2020-07-12 17:43 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-12 17:41 [PATCH 5.9 0/3] send/recv msghdr init cleanups Pavel Begunkov
2020-07-12 17:41 ` [PATCH 1/3] io_uring: rename sr->msg into umsg Pavel Begunkov
2020-07-12 17:41 ` Pavel Begunkov [this message]
2020-07-12 17:41 ` [PATCH 3/3] io_uring: extract io_sendmsg_copy_hdr() Pavel Begunkov
2020-07-12 20:26 ` [PATCH 5.9 0/3] send/recv msghdr init cleanups Jens Axboe
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