From 79025e727a846be6fd215ae9cdb654368ac3f9a6 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Thu, 19 May 2022 17:31:37 -0600
Subject: [PATCH] random: wire up fops->splice_{read,write}_iter()
Git-commit: 79025e727a846be6fd215ae9cdb654368ac3f9a6
Patch-mainline: v5.19-rc1
References: git-fixes

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@kernel.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 a file type restriction in splice_direct_to_actor(), which I'll address separately.]
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/char/random.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -2307,6 +2307,8 @@ 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 = {
@@ -2316,6 +2318,8 @@ const struct file_operations urandom_fop
 	.compat_ioctl = compat_ptr_ioctl,
 	.fasync = random_fasync,
 	.llseek = noop_llseek,
+	.splice_read = generic_file_splice_read,
+	.splice_write = iter_file_splice_write,
 };
 
 SYSCALL_DEFINE3(getrandom, char __user *, buf, size_t, count,