linux-kernel - [PATCH] fs: Allow splicing from character device

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Message-Id: <20200426131730.8438-1-rafal.hibner@secom.com.pl>
Date:   Sun, 26 Apr 2020 15:17:30 +0200
From:   Rafał Hibner <rafal.hibner@...om.com.pl>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Rafał Hibner <rafal.hibner@...om.com.pl>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org (open list:FILESYSTEMS (VFS and
        infrastructure)), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] fs: Allow splicing from character device

Splicing from character devices should be enabled. It allows for
efficient (ZEROCOPY) bulk data tranfers from device.
---
 fs/splice.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/splice.c b/fs/splice.c
index 4735defc46..306d11c5ea 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -920,7 +920,7 @@ ssize_t splice_direct_to_actor(struct file *in, struct splice_desc *sd,
 	 * piped splicing for that!
 	 */
 	i_mode = file_inode(in)->i_mode;
-	if (unlikely(!S_ISREG(i_mode) && !S_ISBLK(i_mode)))
+	if (unlikely(!S_ISREG(i_mode) && !S_ISBLK(i_mode) && !S_ISCHR(i_mode)))
 		return -EINVAL;
 
 	/*
-- 
2.24.1