vfs_glusterfs changes to get rid of mutex use.

Tue Jan 20 00:55:40 MST 2015

On Mon, Jan 19, 2015 at 11:17:08PM -0500, Ira Cooper wrote:
> This patch removes all of the posix mutexes used in the previous GlusterFS
> AIO patch in favor of using a standard POSIX pipe.  This also simplifies
> the actual code, and makes our fork safety issues more apparent.

This looks much better, thanks a lot!

One thing just struck me: If a pipe is much more expensive
than an eventfd, can't we use an eventfd as the indicator?
Per eventfd we might have 64 outstanding requests, each bit
representing one request?

Volker

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