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Re: DMAPI implementation about undeliverable event messages

To: Dean Roehrich <roehrich@xxxxxxx>
Subject: Re: DMAPI implementation about undeliverable event messages
From: Aurelien Degremont - Stagiaire <degremont@xxxxxxxxxxx>
Date: Mon, 07 Mar 2005 17:08:26 +0100
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <20050307154838.CABFF4FDD1@chewtoy.americas.sgi.com>
References: <20050307154838.CABFF4FDD1@chewtoy.americas.sgi.com>
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Dean Roehrich a écrit :
These are often blocked, but interruptible.  Otherwise they're stuck until the
HSM application is restarted so it can continue processing events.

Yes, i saw this, no other solutions ?

There's an issue with the DM_EVENT_UNMOUNT event.
If the HSM application is unavailable, you try to unmount a managed filesystem, the filesystem will start to be unmount, the event msg will be sent, but not received, so the unmount call will be blocked.
Unfortunately, the HSM application will never be able to re-register for the UNMOUNT event for this filesystem, because this filesystem is no longer available as a "loaded and dmapi-compliant" filesystem (we cannot get the filesystem handle anymore), but it's also not unloaded. The system is quite broken for this FS and i see no solution to solve the situation...

Am i clear ? :)


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