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From: Keith Owens <kaos@sgi.com>
To: Martin Rode <martin.rode@programmfabrik.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Callbacks to userspace from VFS ? 
In-Reply-To: Your message of "17 Apr 2002 16:21:13 +0200."
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Date: Thu, 18 Apr 2002 11:22:15 +1000
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On 17 Apr 2002 16:21:13 +0200, 
Martin Rode <martin.rode@programmfabrik.de> wrote:
>after programming at least 10 scripts polling a what we call
>"hot-folder" for new files I had the idea to integrate call backs into
>the file system layer of the linux kernel.
>
>I would like to tell the kernel to callback my program whenever a file
>or directory is being inserted, updated or deleted.

dnotify already exists, although you have to work out what has changed.

XFS implements DMAPI (Data Management API) event callouts which give
much more details.  DMAPI is designed for full blown Hierarchical
Storage Managements systems.
http://www.opengroup.org/pubs/catalog/c429.htm to purchase the DMAPI
standard, there is also a free (with registration) online standard.

Not speaking for SGI.

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