From: Mark Fasheh <mfasheh@suse.de>
To: Adam Borowski <kilobyte@angband.pl>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-btrfs@vger.kernel.org,
"Darrick J . Wong" <darrick.wong@oracle.com>
Subject: Re: [PATCH] vfs: allow FILE_EXTENT_SAME (dedupe_file_range) on a file opened ro
Date: Mon, 18 Jul 2016 12:51:47 -0700 [thread overview]
Message-ID: <20160718195147.GD17171@wotan.suse.de> (raw)
In-Reply-To: <1468793618-10496-1-git-send-email-kilobyte@angband.pl>
On Mon, Jul 18, 2016 at 12:13:38AM +0200, Adam Borowski wrote:
> Instead of checking the mode of the file descriptor, let's check whether it
> could have been opened rw. This allows fixing intermittent exec failures
> when deduping a live system: anyone trying to exec a file currently being
> deduped gets ETXTBSY.
>
> Issuing this ioctl on a ro file was already allowed for root/cap.
>
> Tested on btrfs and not-yet-merged xfs, as only them implement this ioctl.
>
> Signed-off-by: Adam Borowski <kilobyte@angband.pl>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
--Mark
--
Mark Fasheh
next prev parent reply other threads:[~2016-07-18 19:52 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-17 22:13 Adam Borowski
2016-07-17 22:32 ` Adam Borowski
2016-07-18 19:51 ` Mark Fasheh [this message]
2016-07-19 2:41 ` Darrick J. Wong
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