linux-kernel - Re: [regression] getdents() does not list entries created after opening the directory

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Message-ID: <ZvvonHPqrAqSHhgV@casper.infradead.org>
Date: Tue, 1 Oct 2024 13:18:36 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Linux regressions mailing list <regressions@...ts.linux.dev>
Cc: yangerkun <yangerkun@...wei.com>,
	Christian Brauner <brauner@...nel.org>,
	linux-fsdevel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>,
	Krzysztof Małysa <varqox@...il.com>
Subject: Re: [regression] getdents() does not list entries created after
 opening the directory

On Tue, Oct 01, 2024 at 01:29:09PM +0200, Linux regression tracking (Thorsten Leemhuis) wrote:
> > 	DIR* dir = opendir("/tmp/dirent-problems-test-dir");
> > 
> > 	fd = creat("/tmp/dirent-problems-test-dir/after", 0644);

"If a file is removed from or added to the directory after the most
recent call to opendir() or rewinddir(), whether a subsequent call to
readdir() returns an entry for that file is unspecified."

https://pubs.opengroup.org/onlinepubs/007904975/functions/readdir.html

That said, if there's an easy fix here, it'd be a nice improvement to
QoI to do it, but the test-case as written is incorrect.