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From: Rajagopal Ananthanarayanan <ananth@sgi.com>
To: linux-kernel@vger.kernel.org
Cc: axboe@suse.de, torvalds@transmeta.com
Subject: BH_Req question
Date: Tue, 10 Apr 2001 13:12:02 -0700	[thread overview]
Message-ID: <3AD36912.1F9E0654@sgi.com> (raw)


Hi,

It seems BH_Req is set on a buffer_head by submit_bh.
What part of the code unsets this flag during normal
operations? One path seems to be block_flushpage->unmap_buffer
->clear_bit(BH_Req), but IIRC block_flushpage is used only
for truncates. There must be another path to unset BH_Req
under normal memory pressure, or (more unambiguously) on IO completion.

So: in what ways can BH_Req be unset?

Thanks for any input, i've been staring at the code for long without avail ...

cheers,

ananth.

PS: In case why the question: I've got a system with tons of
pages with buffers marked BH_Req, so try_to_free_buffers() bails
out thinking that the buffer is busy ...

-- 
--------------------------------------------------------------------------
Rajagopal Ananthanarayanan ("ananth")
Member Technical Staff, SGI.
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             reply	other threads:[~2001-04-10 20:14 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-04-10 20:12 Rajagopal Ananthanarayanan [this message]
2001-04-10 21:42 ` BH_Req question Andrea Arcangeli
2001-04-10 22:03   ` Rajagopal Ananthanarayanan

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