linux-kernel - [PATCH v4 3/3] splice: fsnotify_access(in), fsnotify

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Message-ID: <1274d6074fdd2ca4e028c8b62e42d0ef2b847703.1687898895.git.nabijaczleweli@nabijaczleweli.xyz>
Date:   Tue, 27 Jun 2023 22:51:04 +0200
From:   Ahelenia Ziemiańska 
        <nabijaczleweli@...ijaczleweli.xyz>
To:     Amir Goldstein <amir73il@...il.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jan Kara <jack@...e.cz>,
        Chung-Chiang Cheng <cccheng@...ology.com>, ltp@...ts.linux.it
Subject: [PATCH v4 3/3] splice: fsnotify_access(in), fsnotify_modify(out) on
 success in tee

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@...ijaczleweli.xyz>
Reviewed-by: Amir Goldstein <amir73il@...il.com>
---
 fs/splice.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/splice.c b/fs/splice.c
index d3a7f4d5c078..bdbabc2ebfff 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1810,6 +1810,11 @@ 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;
 }
 
-- 
2.39.2

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