Date: Thu, 05 Jul 2001 08:35:32 -0600 From: "Justin T. Gibbs" <gibbs@scsiguy.com> 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 Message-ID: <200107051435.f65EZWU60519@aslan.scsiguy.com> In-Reply-To: Your message of "Tue, 03 Jul 2001 23:33:21 %2B0200." <20010703233321.C3398@uriah.heep.sax.de>
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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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