[NET]: restructure sock_aio_{read,write} / sock_{readv,writev}
Mid-term I plan to restructure the file_operations so that we don't need
to have all these duplicate aio and vectored versions. This patch is
a small step in that direction but also a worthwile cleanup on it's own:
(1) introduce a alloc_sock_iocb helper that encapsulates allocating a
proper sock_iocb
(2) add do_sock_read and do_sock_write helpers for common read/write
code
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig
David S. Miller
Родитель
cbeb321a64
Коммит
ce1d4d3e88
248
net/socket.c
248
net/socket.c
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@ -640,92 +640,6 @@ static void sock_aio_dtor(struct kiocb *iocb)
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kfree(iocb->private);
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}
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/*
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* Read data from a socket. ubuf is a user mode pointer. We make sure the user
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* area ubuf...ubuf+size-1 is writable before asking the protocol.
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*/
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static ssize_t sock_aio_read(struct kiocb *iocb, char __user *ubuf,
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size_t size, loff_t pos)
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{
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struct sock_iocb *x, siocb;
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struct socket *sock;
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int flags;
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if (pos != 0)
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return -ESPIPE;
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if (size==0) /* Match SYS5 behaviour */
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return 0;
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if (is_sync_kiocb(iocb))
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x = &siocb;
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else {
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x = kmalloc(sizeof(struct sock_iocb), GFP_KERNEL);
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if (!x)
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return -ENOMEM;
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iocb->ki_dtor = sock_aio_dtor;
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}
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iocb->private = x;
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x->kiocb = iocb;
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sock = iocb->ki_filp->private_data;
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x->async_msg.msg_name = NULL;
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x->async_msg.msg_namelen = 0;
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x->async_msg.msg_iov = &x->async_iov;
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x->async_msg.msg_iovlen = 1;
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x->async_msg.msg_control = NULL;
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x->async_msg.msg_controllen = 0;
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x->async_iov.iov_base = ubuf;
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x->async_iov.iov_len = size;
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flags = !(iocb->ki_filp->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
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return __sock_recvmsg(iocb, sock, &x->async_msg, size, flags);
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}
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/*
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* Write data to a socket. We verify that the user area ubuf..ubuf+size-1
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* is readable by the user process.
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*/
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static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *ubuf,
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size_t size, loff_t pos)
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{
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struct sock_iocb *x, siocb;
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struct socket *sock;
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if (pos != 0)
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return -ESPIPE;
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if(size==0) /* Match SYS5 behaviour */
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return 0;
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if (is_sync_kiocb(iocb))
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x = &siocb;
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else {
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x = kmalloc(sizeof(struct sock_iocb), GFP_KERNEL);
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if (!x)
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return -ENOMEM;
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iocb->ki_dtor = sock_aio_dtor;
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}
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iocb->private = x;
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x->kiocb = iocb;
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sock = iocb->ki_filp->private_data;
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x->async_msg.msg_name = NULL;
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x->async_msg.msg_namelen = 0;
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x->async_msg.msg_iov = &x->async_iov;
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x->async_msg.msg_iovlen = 1;
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x->async_msg.msg_control = NULL;
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x->async_msg.msg_controllen = 0;
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x->async_msg.msg_flags = !(iocb->ki_filp->f_flags & O_NONBLOCK) ? 0 : MSG_DONTWAIT;
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if (sock->type == SOCK_SEQPACKET)
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x->async_msg.msg_flags |= MSG_EOR;
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x->async_iov.iov_base = (void __user *)ubuf;
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x->async_iov.iov_len = size;
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return __sock_sendmsg(iocb, sock, &x->async_msg, size);
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}
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static ssize_t sock_sendpage(struct file *file, struct page *page,
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int offset, size_t size, loff_t *ppos, int more)
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{
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@ -741,53 +655,135 @@ static ssize_t sock_sendpage(struct file *file, struct page *page,
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return sock->ops->sendpage(sock, page, offset, size, flags);
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}
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static int sock_readv_writev(int type,
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struct file * file, const struct iovec * iov,
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long count, size_t size)
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static struct sock_iocb *alloc_sock_iocb(struct kiocb *iocb,
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char __user *ubuf, size_t size, struct sock_iocb *siocb)
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{
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if (!is_sync_kiocb(iocb)) {
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siocb = kmalloc(sizeof(*siocb), GFP_KERNEL);
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if (!siocb)
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return NULL;
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iocb->ki_dtor = sock_aio_dtor;
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}
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siocb->kiocb = iocb;
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siocb->async_iov.iov_base = ubuf;
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siocb->async_iov.iov_len = size;
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iocb->private = siocb;
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return siocb;
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}
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static ssize_t do_sock_read(struct msghdr *msg, struct kiocb *iocb,
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struct file *file, struct iovec *iov, unsigned long nr_segs)
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{
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struct socket *sock = file->private_data;
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size_t size = 0;
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int i;
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for (i = 0 ; i < nr_segs ; i++)
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size += iov[i].iov_len;
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msg->msg_name = NULL;
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msg->msg_namelen = 0;
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msg->msg_control = NULL;
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msg->msg_controllen = 0;
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msg->msg_iov = (struct iovec *) iov;
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msg->msg_iovlen = nr_segs;
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msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
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return __sock_recvmsg(iocb, sock, msg, size, msg->msg_flags);
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}
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static ssize_t sock_readv(struct file *file, const struct iovec *iov,
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unsigned long nr_segs, loff_t *ppos)
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{
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struct kiocb iocb;
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struct sock_iocb siocb;
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struct msghdr msg;
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int ret;
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init_sync_kiocb(&iocb, NULL);
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iocb.private = &siocb;
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ret = do_sock_read(&msg, &iocb, file, (struct iovec *)iov, nr_segs);
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if (-EIOCBQUEUED == ret)
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ret = wait_on_sync_kiocb(&iocb);
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return ret;
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}
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static ssize_t sock_aio_read(struct kiocb *iocb, char __user *ubuf,
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size_t count, loff_t pos)
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{
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struct sock_iocb siocb, *x;
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if (pos != 0)
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return -ESPIPE;
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if (count == 0) /* Match SYS5 behaviour */
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return 0;
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x = alloc_sock_iocb(iocb, ubuf, count, &siocb);
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if (!x)
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return -ENOMEM;
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return do_sock_read(&x->async_msg, iocb, iocb->ki_filp,
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&x->async_iov, 1);
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}
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static ssize_t do_sock_write(struct msghdr *msg, struct kiocb *iocb,
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struct file *file, struct iovec *iov, unsigned long nr_segs)
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{
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struct socket *sock = file->private_data;
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size_t size = 0;
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int i;
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for (i = 0 ; i < nr_segs ; i++)
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size += iov[i].iov_len;
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msg->msg_name = NULL;
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msg->msg_namelen = 0;
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msg->msg_control = NULL;
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msg->msg_controllen = 0;
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msg->msg_iov = (struct iovec *) iov;
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msg->msg_iovlen = nr_segs;
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msg->msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
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if (sock->type == SOCK_SEQPACKET)
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msg->msg_flags |= MSG_EOR;
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return __sock_sendmsg(iocb, sock, msg, size);
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}
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static ssize_t sock_writev(struct file *file, const struct iovec *iov,
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unsigned long nr_segs, loff_t *ppos)
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{
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struct msghdr msg;
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struct socket *sock;
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struct kiocb iocb;
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struct sock_iocb siocb;
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int ret;
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sock = file->private_data;
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init_sync_kiocb(&iocb, NULL);
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iocb.private = &siocb;
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msg.msg_name = NULL;
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msg.msg_namelen = 0;
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msg.msg_control = NULL;
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msg.msg_controllen = 0;
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msg.msg_iov = (struct iovec *) iov;
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msg.msg_iovlen = count;
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msg.msg_flags = (file->f_flags & O_NONBLOCK) ? MSG_DONTWAIT : 0;
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/* read() does a VERIFY_WRITE */
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if (type == VERIFY_WRITE)
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return sock_recvmsg(sock, &msg, size, msg.msg_flags);
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if (sock->type == SOCK_SEQPACKET)
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msg.msg_flags |= MSG_EOR;
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return sock_sendmsg(sock, &msg, size);
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ret = do_sock_write(&msg, &iocb, file, (struct iovec *)iov, nr_segs);
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if (-EIOCBQUEUED == ret)
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ret = wait_on_sync_kiocb(&iocb);
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return ret;
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}
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static ssize_t sock_readv(struct file *file, const struct iovec *vector,
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unsigned long count, loff_t *ppos)
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static ssize_t sock_aio_write(struct kiocb *iocb, const char __user *ubuf,
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size_t count, loff_t pos)
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{
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size_t tot_len = 0;
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int i;
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for (i = 0 ; i < count ; i++)
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tot_len += vector[i].iov_len;
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return sock_readv_writev(VERIFY_WRITE,
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file, vector, count, tot_len);
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}
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static ssize_t sock_writev(struct file *file, const struct iovec *vector,
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unsigned long count, loff_t *ppos)
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{
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size_t tot_len = 0;
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int i;
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for (i = 0 ; i < count ; i++)
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tot_len += vector[i].iov_len;
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return sock_readv_writev(VERIFY_READ,
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file, vector, count, tot_len);
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struct sock_iocb siocb, *x;
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if (pos != 0)
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return -ESPIPE;
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if (count == 0) /* Match SYS5 behaviour */
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return 0;
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x = alloc_sock_iocb(iocb, (void __user *)ubuf, count, &siocb);
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if (!x)
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return -ENOMEM;
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return do_sock_write(&x->async_msg, iocb, iocb->ki_filp,
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&x->async_iov, 1);
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}
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