linux-kernel - Re: [PATCH] Btrfs: remove BUG_ON from get_restripe

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Message-ID: <4F7CEB55.3090307@suse.de>
Date:	Wed, 04 Apr 2012 20:46:13 -0400
From:	Jeff Mahoney <jeffm@...e.de>
To:	Bobby Powers <bobbypowers@...il.com>
Cc:	Ilya Dryomov <idryomov@...il.com>,
	Chris Mason <chris.mason@...cle.com>,
	Andi Kleen <ak@...ux.intel.com>, linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Btrfs: remove BUG_ON from get_restripe_target

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On 04/04/2012 04:19 PM, Bobby Powers wrote:
> spin_is_locked always returns 0 on non-SMP systems, which causes 
> btrfs to fail the mount.  There is documentation pending as to why 
> checking for spin_is_locked is a bad idea:
> 
> https://lkml.org/lkml/2012/3/27/413
> 
> As this was the only location in fs/btrfs/extent-tree.c that did 
> lock-correctness checking in a BUG_ON, simply remove it.
> 
> Signed-off-by: Bobby Powers <bobbypowers@...il.com> CC: Ilya 
> Dryomov <idryomov@...il.com> CC: Chris Mason 
> <chris.mason@...cle.com> CC: Andi Kleen <ak@...ux.intel.com> CC: 
> linux-btrfs@...r.kernel.org CC: linux-kernel@...r.kernel.org --- 
> fs/btrfs/extent-tree.c |    3 --- 1 file changed, 3 deletions(-)
> 
> diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 
> a844204..c98b073 100644 --- a/fs/btrfs/extent-tree.c +++ 
> b/fs/btrfs/extent-tree.c @@ -3158,9 +3158,6 @@ static u64 
> get_restripe_target(struct btrfs_fs_info *fs_info, u64 flags) 
> struct btrfs_balance_control *bctl = fs_info->balance_ctl; u64 
> target = 0;
> 
> -	BUG_ON(!mutex_is_locked(&fs_info->volume_mutex) && - 
> !spin_is_locked(&fs_info->balance_lock)); - if (!bctl) return 0;
> 

Why not replace both of these with lockdep_assert_held as Andi
suggested in his doc?

- -Jeff

- -- 
Jeff Mahoney
SUSE Labs
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