[PATCH 6.1.y 1/3] splice: report related fsnotify events

[Sasha Levin <sashal@kernel.org>]

From: Chung-Chiang Cheng <cccheng@synology.com>

[ Upstream commit 983652c691990b3257a07f67f4263eb847baa82d ]

The fsnotify ACCESS and MODIFY event are missing when manipulating a file
with splice(2).

Signed-off-by: Chung-Chiang Cheng <cccheng@synology.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Acked-by: Jan Kara <jack@suse.cz>
Message-Id: <20230322062519.409752-1-cccheng@synology.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Stable-dep-of: 79b496ebe382 ("splice: avoid stale f_pos writeback on error")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/splice.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/splice.c b/fs/splice.c
index d0230cf8ec571..30b669aca152d 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -30,6 +30,7 @@
 #include <linux/export.h>
 #include <linux/syscalls.h>
 #include <linux/uio.h>
+#include <linux/fsnotify.h>
 #include <linux/security.h>
 #include <linux/gfp.h>
 #include <linux/socket.h>
@@ -1102,6 +1103,9 @@ long do_splice(struct file *in, loff_t *off_in, struct file *out,
 		ret = do_splice_from(ipipe, out, &offset, len, flags);
 		file_end_write(out);
 
+		if (ret > 0)
+			fsnotify_modify(out);
+
 		if (!off_out)
 			out->f_pos = offset;
 		else
@@ -1125,6 +1129,10 @@ long do_splice(struct file *in, loff_t *off_in, struct file *out,
 			flags |= SPLICE_F_NONBLOCK;
 
 		ret = splice_file_to_pipe(in, opipe, &offset, len, flags);
+
+		if (ret > 0)
+			fsnotify_access(in);
+
 		if (!off_in)
 			in->f_pos = offset;
 		else
-- 
2.53.0