Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752269AbaKYOII (ORCPT ); Tue, 25 Nov 2014 09:08:08 -0500 Received: from zeniv.linux.org.uk ([195.92.253.2]:44194 "EHLO ZenIV.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751423AbaKYOCd (ORCPT ); Tue, 25 Nov 2014 09:02:33 -0500 From: Al Viro To: David Miller Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 05/17] switch drivers/net/tun.c to ->read_iter() Date: Tue, 25 Nov 2014 14:02:19 +0000 Message-Id: <1416924151-28698-5-git-send-email-viro@ZenIV.linux.org.uk> X-Mailer: git-send-email 1.7.7.6 In-Reply-To: <20141125024018.GH7996@ZenIV.linux.org.uk> References: <20141125024018.GH7996@ZenIV.linux.org.uk> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Al Viro Signed-off-by: Al Viro --- drivers/net/tun.c | 40 +++++++++++++++------------------------- 1 file changed, 15 insertions(+), 25 deletions(-) diff --git a/drivers/net/tun.c b/drivers/net/tun.c index ac53a73..405dfdf 100644 --- 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, -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/