fs/pipe: allow sendfile() to pipe again

After commit 36e2c74 ("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: [email protected]
Fixes: 36e2c74 ("fs: don't allow splice read/write without explicit ops")
Suggested-by: Christoph Hellwig <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Tested-by: Johannes Berg <[email protected]>
Signed-off-by: Johannes Berg <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: jmberg

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,
 };
 
 /*