Date: Fri, 20 Jan 2006 11:11:45 -0800 From: Sean Bruno <sbruno@miralink.com> To: freebsd-stable@freebsd.org Subject: 4.11 b_iodone callback question Message-ID: <1137784305.12979.6.camel@localhost.localdomain>
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I just inherited some older code that runs under 4.11 ... the core of software is a device driver that writes data to two separate disks(da1/da2). It appears that the authors are using a call back function to handle some interesting behavior related to the second disk being a circular buffer. So a couple of questions: 1. Does the call back routine set in b_iodone(disk writes are handled by VOP_STRATEGY) get invoked in a separate thread of execution, i.e. is simultaneous with the main code path? 2. Is it o.k. to have the callback routine invoke itself vi b_iodone(more VOP_STRATEGY) without locking the buffers used for the disk writes? Sean Bruno
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