fs/pipe: allow sendfile() to pipe again

stable inclusion
from stable-5.10.11
commit e8572713897eb9e4bfaef90bf15d5dd00d7126fc
bugzilla: 47621

--------------------------------

commit f8ad8187 upstream.

After commit 36e2c742 ("fs: don't allow splice read/write
without explicit ops") sendfile() could no longer send data
from a real file to a pipe, breaking for example certain cgit
setups (e.g. when running behind fcgiwrap), because in this
case cgit will try to do exactly this: sendfile() to a pipe.

Fix this by using iter_file_splice_write for the splice_write
method of pipes, as suggested by Christoph.

Cc: stable@vger.kernel.org
Fixes: 36e2c742 ("fs: don't allow splice read/write without explicit ops")
Suggested-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Tested-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>

fs/pipe.c

@@ -1206,6 +1206,7 @@ const struct file_operations pipefifo_fops = {
 	.unlocked_ioctl	= pipe_ioctl,
 	.release	= pipe_release,
 	.fasync		= pipe_fasync,
+	.splice_write	= iter_file_splice_write,
 };
 
 /*