linux-kernel - [PATCH] fs: sendfile handles O_NONBLOCK of out

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Date:   Thu, 14 Apr 2022 17:50:15 -0700
From:   Andrei Vagin <avagin@...il.com>
To:     linux-kernel@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>
Cc:     linux-fsdevel@...r.kernel.org, Andrei Vagin <avagin@...il.com>,
        stable@...nel.org
Subject: [PATCH] fs: sendfile handles O_NONBLOCK of out_fd

sendfile has to return EAGAIN if out_fd is nonblocking and the write
into it would block.

Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: stable@...nel.org
Fixes: b964bf53e540 ("teach sendfile(2) to handle send-to-pipe directly")
Signed-off-by: Andrei Vagin <avagin@...il.com>
---
 fs/read_write.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/read_write.c b/fs/read_write.c
index e643aec2b0ef..ee59419cbf0f 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1247,6 +1247,9 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
 					  count, fl);
 		file_end_write(out.file);
 	} else {
+		if (out.file->f_flags & O_NONBLOCK)
+			fl |= SPLICE_F_NONBLOCK;
+
 		retval = splice_file_to_pipe(in.file, opipe, &pos, count, fl);
 	}
 
-- 
2.35.1