From owner-freebsd-questions  Fri Sep 29  2:29:44 2000
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Date: Fri, 29 Sep 2000 02:29:11 -0700
From: Alfred Perlstein <bright@wintelcom.net>
To: bsdnewbie bsdnewbie <bsdnewbie@hotmail.com>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: _use bread(...) to access /dev/ad1 ???!!!
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References: <F163Q1B5QDnEDisywkG00007810@hotmail.com>
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In-Reply-To: <F163Q1B5QDnEDisywkG00007810@hotmail.com>; from bsdnewbie@hotmail.com on Fri, Sep 29, 2000 at 04:58:44PM -0600
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* bsdnewbie bsdnewbie <bsdnewbie@hotmail.com> [000929 01:58] wrote:
> I want to access /dev/ad1 via the strategy function "adstrategy" in the file 
> "ata-disk.c".
> 
> I can get the dev_t & softc structure of ad1 and no slice on ad1 was 
> mounted.
> 
> My problem is:
> 1) How to call the function adstategy?
> 
> 2) Someone said that the function bread(struct vnode *, ...) can do, but I 
> do not know how to get the vnode arg.  How to use this function? The "man 
> vnode" said that an active file has a vnode, and in unix, devices are also 
> files, so it seems that ad1 has a corresponding vnode, but how to get it?
> 
> 3) if bread() is used to read, bwrite() is used to write, why bwrite does 
> not has the vnode arg while bread have?
> 

I'm guessing it's 

int
bdevvp(dev, vpp)

but i may be wrong.

-Alfred


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