linux-ext4 - Read operations and journaled data

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Message-ID: <CAM3FfDwJhWNO39xrodOFcjQJKE+BD3fNH3t5C5SUtzYubAbGMA@mail.gmail.com>
Date:	Tue, 26 Jun 2012 19:58:12 -0300
From:	Pedro Eugênio Rocha 
	<pedro.eugenio.rocha@...il.com>
To:	linux-ext4@...r.kernel.org
Subject: Read operations and journaled data

Hi guys,

I have a quick (kind of dumb) question for you about
journaling.

I know that ext4 postpones checkpoints in data journaling
mode, i.e., most of data (and meta-data) are only written
to the journal and checkpointed to their final location only
when certain thresholds are crossed. My question is: how
do ext4 handle read operations to data blocks that are only
written to the journal (supposing that its cache has been
evicted)? Does it execute the read operation in the journaled
data? Does it trigger a checkpoint?

Probably I'm missing something here.

Thanks

-- 
Pedro Eugênio Rocha
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