linux-kernel - Re: [PATCH] btrfs: unlock i_mutex after attempting to delete subvolume during send

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Message-ID: <20150330130005.GF32051@twin.jikos.cz>
Date:	Mon, 30 Mar 2015 15:00:05 +0200
From:	David Sterba <dsterba@...e.cz>
To:	Filipe David Manana <fdmanana@...il.com>
Cc:	Omar Sandoval <osandov@...ndov.com>, Chris Mason <clm@...com>,
	Josef Bacik <jbacik@...com>, David Sterba <dsterba@...e.cz>,
	Filipe Manana <fdmanana@...e.com>,
	"linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] btrfs: unlock i_mutex after attempting to delete
 subvolume during send

On Sat, Mar 28, 2015 at 11:37:43AM +0000, Filipe David Manana wrote:
> On Sat, Mar 28, 2015 at 11:02 AM, Omar Sandoval <osandov@...ndov.com> wrote:
> > Whenever the check for a send in progress introduced in commit
> > 521e0546c970 (btrfs: protect snapshots from deleting during send) is
> > hit, we return without unlocking inode->i_mutex. This is easy to see
> > with lockdep enabled:
> >
> > [  +0.000059] ================================================
> > [  +0.000028] [ BUG: lock held when returning to user space! ]
> > [  +0.000029] 4.0.0-rc5-00096-g3c435c1 #93 Not tainted
> > [  +0.000026] ------------------------------------------------
> > [  +0.000029] btrfs/211 is leaving the kernel with locks still held!
> > [  +0.000029] 1 lock held by btrfs/211:
> > [  +0.000023]  #0:  (&type->i_mutex_dir_key){+.+.+.}, at: [<ffffffff8135b8df>] btrfs_ioctl_snap_destroy+0x2df/0x7a0
> >
> > Make sure we unlock it in the error path.
> >
> > Signed-off-by: Omar Sandoval <osandov@...ndov.com>
> Reviewed-by: Filipe Manana <fdmanana@...e.com>
> 
> Thanks, should go to stable in my opinion.

Agreed.
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