linux-kernel - [PATCH 5.10 198/199] kernfs: wire up ->splice_read and ->splice

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Date:   Mon, 25 Jan 2021 19:40:20 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Siddharth Gupta <sidgup@...eaurora.org>,
        Christoph Hellwig <hch@....de>
Subject: [PATCH 5.10 198/199] kernfs: wire up ->splice_read and ->splice_write

From: Christoph Hellwig <hch@....de>

commit f2d6c2708bd84ca953fa6b6ca5717e79eb0140c7 upstream.

Wire up the splice_read and splice_write methods to the default
helpers using ->read_iter and ->write_iter now that those are
implemented for kernfs.  This restores support to use splice and
sendfile on kernfs files.

Fixes: 36e2c7421f02 ("fs: don't allow splice read/write without explicit ops")
Reported-by: Siddharth Gupta <sidgup@...eaurora.org>
Tested-by: Siddharth Gupta <sidgup@...eaurora.org>
Signed-off-by: Christoph Hellwig <hch@....de>
Link: https://lore.kernel.org/r/20210120204631.274206-4-hch@lst.de
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/kernfs/file.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -949,6 +949,8 @@ const struct file_operations kernfs_file
 	.release	= kernfs_fop_release,
 	.poll		= kernfs_fop_poll,
 	.fsync		= noop_fsync,
+	.splice_read	= generic_file_splice_read,
+	.splice_write	= iter_file_splice_write,
 };
 
 /**