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X-Comment-To: Andrew Morton
To: Andrew Morton <akpm@digeo.com>
Cc: Alex Tomas <bzzz@tmi.comex.ru>, linux-kernel@alex.org.uk,
       linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: 2.5.59-mm5
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From: Alex Tomas <bzzz@tmi.comex.ru>
Organization: HOME
Date: 24 Jan 2003 22:58:13 +0300
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>>>>> Andrew Morton (AM) writes:

 AM> We cannot free disk blocks until I/O against them has completed.
 AM> Otherwise the block could be reused for something else, then the
 AM> old IO will scribble on the new data.

 AM> What we _can_ do is to defer the waiting - only wait on the I/O
 AM> when someone reuses the disk blocks.  So there are actually
 AM> unused blocks with I/O in flight against them.

 AM> We do that for metadata (the wait happens in
 AM> unmap_underlying_metadata()) but for file data blocks there is no
 AM> mechanism in place to look them up

yeah! indeed. my stupid mistake ...




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