linux-kernel - [RFC -next 06/10] fs: Extend do_sendfile to take a flags argument

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Message-ID: <20250319001521.53249-7-jdamato@fastly.com>
Date: Wed, 19 Mar 2025 00:15:17 +0000
From: Joe Damato <jdamato@...tly.com>
To: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	asml.silence@...il.com,
	linux-fsdevel@...r.kernel.org,
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	Joe Damato <jdamato@...tly.com>
Subject: [RFC -next 06/10] fs: Extend do_sendfile to take a flags argument

Extend the internal do_sendfile to take a flags argument, which will be
used in future commits to signal that userland wants zerocopy
notifications.

This commit does not change anything about sendfile or sendfile64.

Signed-off-by: Joe Damato <jdamato@...tly.com>
---
 fs/read_write.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/fs/read_write.c b/fs/read_write.c
index a6133241dfb8..03d2a93c3d1b 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1293,7 +1293,7 @@ COMPAT_SYSCALL_DEFINE6(pwritev2, compat_ulong_t, fd,
 #endif /* CONFIG_COMPAT */
 
 static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
-			   size_t count, loff_t max)
+			   size_t count, loff_t max, int flags)
 {
 	struct inode *in_inode, *out_inode;
 	struct pipe_inode_info *opipe;
@@ -1398,13 +1398,13 @@ SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd, off_t __user *, offset, size_
 		if (unlikely(get_user(off, offset)))
 			return -EFAULT;
 		pos = off;
-		ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS);
+		ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS, 0);
 		if (unlikely(put_user(pos, offset)))
 			return -EFAULT;
 		return ret;
 	}
 
-	return do_sendfile(out_fd, in_fd, NULL, count, 0);
+	return do_sendfile(out_fd, in_fd, NULL, count, 0, 0);
 }
 
 SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, loff_t __user *, offset, size_t, count)
@@ -1415,13 +1415,13 @@ SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, loff_t __user *, offset, si
 	if (offset) {
 		if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t))))
 			return -EFAULT;
-		ret = do_sendfile(out_fd, in_fd, &pos, count, 0);
+		ret = do_sendfile(out_fd, in_fd, &pos, count, 0, 0);
 		if (unlikely(put_user(pos, offset)))
 			return -EFAULT;
 		return ret;
 	}
 
-	return do_sendfile(out_fd, in_fd, NULL, count, 0);
+	return do_sendfile(out_fd, in_fd, NULL, count, 0, 0);
 }
 
 #ifdef CONFIG_COMPAT
@@ -1436,13 +1436,13 @@ COMPAT_SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd,
 		if (unlikely(get_user(off, offset)))
 			return -EFAULT;
 		pos = off;
-		ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS);
+		ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS, 0);
 		if (unlikely(put_user(pos, offset)))
 			return -EFAULT;
 		return ret;
 	}
 
-	return do_sendfile(out_fd, in_fd, NULL, count, 0);
+	return do_sendfile(out_fd, in_fd, NULL, count, 0, 0);
 }
 
 COMPAT_SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd,
@@ -1454,13 +1454,13 @@ COMPAT_SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd,
 	if (offset) {
 		if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t))))
 			return -EFAULT;
-		ret = do_sendfile(out_fd, in_fd, &pos, count, 0);
+		ret = do_sendfile(out_fd, in_fd, &pos, count, 0, 0);
 		if (unlikely(put_user(pos, offset)))
 			return -EFAULT;
 		return ret;
 	}
 
-	return do_sendfile(out_fd, in_fd, NULL, count, 0);
+	return do_sendfile(out_fd, in_fd, NULL, count, 0, 0);
 }
 #endif
 
-- 
2.43.0