linux-ext4 - [Bug 197045] renameat2 rename

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Message-ID: <bug-197045-13602-0WYLoK3uXE@https.bugzilla.kernel.org/>
Date:   Tue, 24 Oct 2017 12:29:42 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...nel.org
Subject: [Bug 197045] renameat2 rename_noreplace

https://bugzilla.kernel.org/show_bug.cgi?id=197045

--- Comment #3 from Elvis Stansvik (elvstone@...il.com) ---
I'm hit by this on 4.10 a well (the default kernel on Ubuntu 16.04).

I attached a full test case showing.

Example run:


> [estan@...ton renameat2tc]$ gcc renameat2.c 
> [estan@...ton renameat2tc]$ touch foo
> [estan@...ton renameat2tc]$ ./a.out foo bar
> Invalid argument
> [estan@...ton renameat2tc]$ uname -a
> Linux newton 4.10.0-37-generic #41~16.04.1-Ubuntu SMP Fri Oct 6 22:42:59 UTC
> 2017 x86_64 x86_64 x86_64 GNU/Linux
> [estan@...ton renameat2tc]$ mount | grep " / "
> /dev/sda1 on / type ext4 (rw,noatime,discard,errors=remount-ro,data=ordered)

The reason I discovered it was that Qt recently started using this syscall,
which in turn made Qt Creator (a Qt application) fail to write its config
files.

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