linux-kernel - Re: [PATCH] reiserfs: Truncate blocks not used by a write

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Message-ID: <20090901174255.GA9051@infradead.org>
Date:	Tue, 1 Sep 2009 13:42:56 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Jan Kara <jack@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	reiserfs-devel@...r.kernel.org, jeffm@...e.com,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] reiserfs: Truncate blocks not used by a write

On Tue, Sep 01, 2009 at 05:55:54PM +0200, Jan Kara wrote:
> It can happen that write does not use all the blocks allocated in write_begin
> either because of some filesystem error (like ENOSPC) or because page with
> data to write has been removed from memory. We truncate these blocks so that
> we don't have dangling blocks beyond i_size. 

vmtruncate is in the process of going away for 2.6.32.  Please use a
filesystems-specific routine to just trim the blocks, similar to what
the vmtruncate call in the generic write_begin helper is beeing replaced
with in Nick's truncate patch series.

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