linux-kernel - Re: clustered MD

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Message-ID: <20150612184623.GA5130@redhat.com>
Date:	Fri, 12 Jun 2015 13:46:23 -0500
From:	David Teigland <teigland@...hat.com>
To:	Neil Brown <neilb@...e.de>
Cc:	Goldwyn Rodrigues <rgoldwyn@...e.com>, linux-kernel@...r.kernel.org
Subject: Re: clustered MD

When a node fails, its dirty areas get special treatment from other nodes
using the area_resyncing() function.  Should the suspend_list be created
before any reads or writes from the file system are processed by md?  It
seems to me that gfs journal recovery could read/write to dirty regions
(from the failed node) before md was finished setting up the suspend_list.
md could probably prevent that by using the recover_prep() dlm callback to
set a flag that would block any i/o that arrived before the suspend_list
was ready.

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