linux-kernel - Re: [PATCH 1/2] Add new spin_lock for i_flags of xfs

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Date:	Wed, 23 Aug 2006 21:38:17 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Masayuki Saito <m-saito@...s.nec.co.jp>
Cc:	Nathan Scott <nathans@....com>, David Chinner <dgc@....com>,
	xfs@....sgi.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] Add new spin_lock for i_flags of xfs_inode [try #2]

On Wed, 23 Aug 2006 20:12:51 +0900
Masayuki Saito <m-saito@...s.nec.co.jp> wrote:

> It is the problem that i_flags of xfs_inode has no consistent
> locking protection.
> 
> For the reason, I define a new spin_lock(i_flags_lock) for i_flags
> of xfs_inode.  And I add this spin_lock for appropriate places.

You could simply use inode.i_lock for this.  i_lock is a general-purpose
per-inode lock.  Its mandate is "use it for whatever you like, but it must
always be `innermost'"
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