linux-kernel - [PATCH v4 3/3] random: wire up fops->splice_{read,write}

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Date:   Fri, 20 May 2022 11:44:59 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Jens Axboe <axboe@...nel.dk>, Theodore Ts'o <tytso@....edu>,
        Christoph Hellwig <hch@....de>,
        LKML <linux-kernel@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>
Cc:     "Jason A . Donenfeld" <Jason@...c4.com>
Subject: [PATCH v4 3/3] random: wire up fops->splice_{read,write}_iter()

From: Jens Axboe <axboe@...nel.dk>

Now that random/urandom is using {read,write}_iter, we can wire it up to
using the generic splice handlers.

Fixes: 36e2c7421f02 ("fs: don't allow splice read/write without explicit ops")
Signed-off-by: Jens Axboe <axboe@...nel.dk>
[Jason: added the splice_write path. Note that sendfile() and such still
 does not work for read, though it does for write, because of the
 outdated file type restriction in splice_direct_to_actor(), which I'll
 address separately.]
Cc: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
---
 drivers/char/random.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 831cafcd1034..15a9e5ea1b3f 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1412,6 +1412,8 @@ const struct file_operations random_fops = {
 	.compat_ioctl = compat_ptr_ioctl,
 	.fasync = random_fasync,
 	.llseek = noop_llseek,
+	.splice_read = generic_file_splice_read,
+	.splice_write = iter_file_splice_write,
 };
 
 const struct file_operations urandom_fops = {
@@ -1421,6 +1423,8 @@ const struct file_operations urandom_fops = {
 	.compat_ioctl = compat_ptr_ioctl,
 	.fasync = random_fasync,
 	.llseek = noop_llseek,
+	.splice_read = generic_file_splice_read,
+	.splice_write = iter_file_splice_write,
 };
 
 
-- 
2.35.1