linux-kernel - [PATCH v4 0/3] fanotify accounting for fs/splice.c

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Date:   Tue, 27 Jun 2023 22:50:46 +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 0/3] fanotify accounting for fs/splice.c

Always generate modify out, access in for splice;
this gets automatically merged with no ugly special cases.

No changes to 2/3 or 3/3.

Ahelenia Ziemiańska (3):
  splice: always fsnotify_access(in), fsnotify_modify(out) on success
  splice: fsnotify_access(fd)/fsnotify_modify(fd) in vmsplice
  splice: fsnotify_access(in), fsnotify_modify(out) on success in tee

 fs/splice.c | 38 ++++++++++++++++++++------------------
 1 file changed, 20 insertions(+), 18 deletions(-)

Interdiff against v3:
diff --git a/fs/splice.c b/fs/splice.c
index 2ecfccbda956..bdbabc2ebfff 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1184,10 +1184,6 @@ long do_splice(struct file *in, loff_t *off_in, struct file *out,
 			out->f_pos = offset;
 		else
 			*off_out = offset;
-
-		// splice_write-> already marked out
-		// as modified via vfs_iter_write()
-		goto noaccessout;
 	} else if (opipe) {
 		if (off_out)
 			return -ESPIPE;
@@ -1211,11 +1207,10 @@ long do_splice(struct file *in, loff_t *off_in, struct file *out,
 	} else
 		return -EINVAL;
 
-	if (ret > 0)
+	if (ret > 0) {
 		fsnotify_modify(out);
-noaccessout:
-	if (ret > 0)
 		fsnotify_access(in);
+	}
 
 	return ret;
 }
-- 
2.39.2

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