[RFC -next 07/10] fs: Add sendfile2 which accepts a flags argument

[Joe Damato <jdamato@fastly.com>]

Add sendfile2 which is similar to sendfile64, but takes a flags
argument.

Signed-off-by: Joe Damato <jdamato@fastly.com>
---
 fs/read_write.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/fs/read_write.c b/fs/read_write.c
index 03d2a93c3d1b..057e5f37645d 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1424,6 +1424,23 @@ SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, loff_t __user *, offset, si
 	return do_sendfile(out_fd, in_fd, NULL, count, 0, 0);
 }
 
+SYSCALL_DEFINE5(sendfile2, int, out_fd, int, in_fd, loff_t __user *, offset, size_t, count, int, flags)
+{
+	loff_t pos;
+	ssize_t ret;
+
+	if (offset) {
+		if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t))))
+			return -EFAULT;
+		ret = do_sendfile(out_fd, in_fd, &pos, count, 0, flags);
+		if (unlikely(put_user(pos, offset)))
+			return -EFAULT;
+		return ret;
+	}
+
+	return do_sendfile(out_fd, in_fd, NULL, count, 0, flags);
+}
+
 #ifdef CONFIG_COMPAT
 COMPAT_SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd,
 		compat_off_t __user *, offset, compat_size_t, count)
-- 
2.43.0