linux-kernel - Re: loop subsystem corrupted after mounting multiple btrfs sub-volumes

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Message-ID: <52677.1456524057@turing-police.cc.vt.edu>
Date:	Fri, 26 Feb 2016 17:00:57 -0500
From:	Valdis.Kletnieks@...edu
To:	Stanislav Brabec <sbrabec@...e.cz>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	"Austin S. Hemmelgarn" <ahferroin7@...il.com>,
	linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
	Btrfs BTRFS <linux-btrfs@...r.kernel.org>,
	David Sterba <dsterba@...e.cz>
Subject: Re: loop subsystem corrupted after mounting multiple btrfs sub-volumes

On Fri, 26 Feb 2016 22:00:44 +0100, Stanislav Brabec said:

> Well, it seems to be safe, even if the loop device was not allocated by 
> mount(8) itself, as
> ioctl(fd, LOOP_CLR_FD)
> never returns EBUSY:

The fact you don't get an EBUSY doesn't mean it's actually safe....

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