switch drivers/net/tun.c to ->read_iter()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index ac53a7316ecd55b5b081072f4e16e3e09b3625be..405dfdf4f8c84e9acb5383851fbf660beed585ee 100644 (file)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1339,18 +1339,17 @@ done:
 }
 
 static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile,
-                          const struct iovec *iv, unsigned long segs,
-                          ssize_t len, int noblock)
+                          struct iov_iter *to,
+                          int noblock)
 {
        struct sk_buff *skb;
-       ssize_t ret = 0;
+       ssize_t ret;
        int peeked, err, off = 0;
-       struct iov_iter iter;
 
        tun_debug(KERN_INFO, tun, "tun_do_read\n");
 
-       if (!len)
-               return ret;
+       if (!iov_iter_count(to))
+               return 0;
 
        if (tun->dev->reg_state != NETREG_REGISTERED)
                return -EIO;
@@ -1359,37 +1358,27 @@ static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile,
        skb = __skb_recv_datagram(tfile->socket.sk, noblock ? MSG_DONTWAIT : 0,
                                  &peeked, &off, &err);
        if (!skb)
-               return ret;
+               return 0;
 
-       iov_iter_init(&iter, READ, iv, segs, len);
-       ret = tun_put_user(tun, tfile, skb, &iter);
+       ret = tun_put_user(tun, tfile, skb, to);
        kfree_skb(skb);
 
        return ret;
 }
 
-static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv,
-                           unsigned long count, loff_t pos)
+static ssize_t tun_chr_read_iter(struct kiocb *iocb, struct iov_iter *to)
 {
        struct file *file = iocb->ki_filp;
        struct tun_file *tfile = file->private_data;
        struct tun_struct *tun = __tun_get(tfile);
-       ssize_t len, ret;
+       ssize_t len = iov_iter_count(to), ret;
 
        if (!tun)
                return -EBADFD;
-       len = iov_length(iv, count);
-       if (len < 0) {
-               ret = -EINVAL;
-               goto out;
-       }
-
-       ret = tun_do_read(tun, tfile, iv, count, len,
-                         file->f_flags & O_NONBLOCK);
+       ret = tun_do_read(tun, tfile, to, file->f_flags & O_NONBLOCK);
        ret = min_t(ssize_t, ret, len);
        if (ret > 0)
                iocb->ki_pos = ret;
-out:
        tun_put(tun);
        return ret;
 }
@@ -1471,6 +1460,7 @@ static int tun_recvmsg(struct kiocb *iocb, struct socket *sock,
 {
        struct tun_file *tfile = container_of(sock, struct tun_file, socket);
        struct tun_struct *tun = __tun_get(tfile);
+       struct iov_iter to;
        int ret;
 
        if (!tun)
@@ -1485,8 +1475,8 @@ static int tun_recvmsg(struct kiocb *iocb, struct socket *sock,
                                         SOL_PACKET, TUN_TX_TIMESTAMP);
                goto out;
        }
-       ret = tun_do_read(tun, tfile, m->msg_iov, m->msg_iovlen, total_len,
-                         flags & MSG_DONTWAIT);
+       iov_iter_init(&to, READ, m->msg_iov, m->msg_iovlen, total_len);
+       ret = tun_do_read(tun, tfile, &to, flags & MSG_DONTWAIT);
        if (ret > total_len) {
                m->msg_flags |= MSG_TRUNC;
                ret = flags & MSG_TRUNC ? ret : total_len;
@@ -2242,8 +2232,8 @@ static int tun_chr_show_fdinfo(struct seq_file *m, struct file *f)
 static const struct file_operations tun_fops = {
        .owner  = THIS_MODULE,
        .llseek = no_llseek,
-       .read  = do_sync_read,
-       .aio_read  = tun_chr_aio_read,
+       .read  = new_sync_read,
+       .read_iter  = tun_chr_read_iter,
        .write = do_sync_write,
        .aio_write = tun_chr_aio_write,
        .poll   = tun_chr_poll,