linux-kernel - Re: [REGRESSION 4.11] Commit d8514d8edb5b ("ovl: copy up regular file using O

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Date:   Tue, 28 Mar 2017 13:28:18 +0200
From:   Ralph Sennhauser <ralph.sennhauser@...il.com>
To:     Amir Goldstein <amir73il@...il.com>
Cc:     Miklos Szeredi <miklos@...redi.hu>, linux-unionfs@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-mtd@...ts.infradead.org, regressions@...mhuis.info,
        Richard Weinberger <richard@....at>,
        Artem Bityutskiy <dedekind1@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ralph Sennhauser <ralph.sennhauser@...il.com>
Subject: Re: [REGRESSION 4.11] Commit d8514d8edb5b ("ovl: copy up regular
 file using O_TMPFILE") breaks ubifs

Hi Amir,

On Tue, 28 Mar 2017 07:03:11 -0400
Amir Goldstein <amir73il@...il.com> wrote:

> Overlayfs now uses O_TMPFILE for copy up and it works fine with all
> the file systems I tested (tmpfs, xfs, ext4).
> If I am right and O_TMPFILE is broken in ubifs, you are most likely
> the first person to test it (indirectly by overlayfs).
> 
> Please try to reproduce the bug with following patch to disable ubifs
> O_TMPFILE support:
> 
> --- a/fs/ubifs/dir.c
> +++ b/fs/ubifs/dir.c
> @@ -1685,7 +1685,7 @@ const struct inode_operations
> ubifs_dir_inode_operations = {
>  #ifdef CONFIG_UBIFS_ATIME_SUPPORT
>         .update_time = ubifs_update_time,
>  #endif
> -       .tmpfile     = ubifs_tmpfile,
> +       //.tmpfile     = ubifs_tmpfile,
>  };

Get a unused warning during build but all seems to be working fine now.

Thanks
Ralph