From owner-cvs-all  Thu Jul  5  7:35:43 2001
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To: Joerg Wunsch <joerg_wunsch@uriah.heep.sax.de>
Cc: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/sys/sys bio.h 
In-Reply-To: Your message of "Tue, 03 Jul 2001 23:33:21 +0200."
             <20010703233321.C3398@uriah.heep.sax.de> 
Date: Thu, 05 Jul 2001 08:35:32 -0600
From: "Justin T. Gibbs" <gibbs@scsiguy.com>
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>I don't need a private structure (i would have malloced it then), just
>a few values in a private scalar variable/field (only a couple of
>values would have sufficed for me, but bde pointed out that something
>like the ATA driver might have use for more distinct values here).

Why not use a union in bio for any "private use space" we care to
put in it?  This is what cam does:

typedef union {
        void            *ptr;
        u_long          field;
        u_int8_t        bytes[sizeof(void *) > sizeof(u_long)
                              ? sizeof(void *) : sizeof(u_long)];
} ccb_priv_entry;

--
Justin

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