From: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Date: Mon, 3 Jul 2023 14:42:21 +0000 (+0200)
Subject: splice: fsnotify_access(in), fsnotify_modify(out) on success in tee
X-Git-Tag: v6.4.16~630
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8c079dd85f33ce2b44452351afb4c16ab8e1e040;p=thirdparty%2Fkernel%2Fstable.git

splice: fsnotify_access(in), fsnotify_modify(out) on success in tee

[ Upstream commit 576d498e0ac5caff2d9f6312573ab54d98f12d32 ]

Same logic applies here: this can fill up the pipe, and pollers that rely
on getting IN_MODIFY notifications never wake up.

Fixes: 983652c69199 ("splice: report related fsnotify events")
Link: https://lore.kernel.org/linux-fsdevel/jbyihkyk5dtaohdwjyivambb2gffyjs3dodpofafnkkunxq7bu@jngkdxx65pux/t/#u
Link: https://bugs.debian.org/1039488
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Acked-by: Jan Kara <jack@suse.cz>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Message-Id: <10d76dd8c85017ae3cd047c9b9a32e26daefdaa2.1688393619.git.nabijaczleweli@nabijaczleweli.xyz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/fs/splice.c b/fs/splice.c
index c08eb445a1d20..3ae2de263e806 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1815,6 +1815,11 @@ long do_tee(struct file *in, struct file *out, size_t len, unsigned int flags)
 		}
 	}
 
+	if (ret > 0) {
+		fsnotify_access(in);
+		fsnotify_modify(out);
+	}
+
 	return ret;
 }