linux-kernel - [PATCH RFC 3/3] splice: add support of splicing to packetized pipe

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Message-ID: <20151215172912.16355.90422.stgit@localhost.localdomain>
Date:	Tue, 15 Dec 2015 21:29:12 +0400
From:	Stanislav Kinsburskiy <skinsbursky@...tuozzo.com>
To:	linux-fsdevel@...r.kernel.org, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org
Cc:	criu@...nvz.org, skinsbursky@...tuozzo.com
Subject: [PATCH RFC 3/3] splice: add support of splicing to packetized pipe

This patch uses SPLICE_F_PACKET as a flag, representing packetized pipe.
In splice_to_pipe() this flag is converted into PIPE_BUF_FLAG_PACKET on pipe
buffer.

Signed-off-by: Stanislav Kinsburskiy <skinsbursky@...tuozzo.com>
---
 fs/splice.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/splice.c b/fs/splice.c
index 4cf700d..d698fb2 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -210,6 +210,8 @@ ssize_t splice_to_pipe(struct pipe_inode_info *pipe,
 			buf->ops = spd->ops;
 			if (spd->flags & SPLICE_F_GIFT)
 				buf->flags |= PIPE_BUF_FLAG_GIFT;
+			if (spd->flags & SPLICE_F_PACKET)
+				buf->flags |= PIPE_BUF_FLAG_PACKET;
 
 			pipe->nrbufs++;
 			page_nr++;
@@ -1420,6 +1422,9 @@ static long do_splice(struct file *in, loff_t __user *off_in,
 			offset = in->f_pos;
 		}
 
+		if (is_packetized(out))
+			flags |= SPLICE_F_PACKET;
+
 		ret = do_splice_to(in, &offset, opipe, len, flags);
 
 		if (!off_in)
@@ -1609,6 +1614,9 @@ static long vmsplice_to_pipe(struct file *file, const struct iovec __user *iov,
 	if (splice_grow_spd(pipe, &spd))
 		return -ENOMEM;
 
+	if (is_packetized(file))
+		spd.flags |= SPLICE_F_PACKET;
+
 	spd.nr_pages = get_iovec_page_array(iov, nr_segs, spd.pages,
 					    spd.partial, false,
 					    spd.nr_pages_max);

--
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