Date: Tue, 15 Feb 2011 01:19:45 +0100 From: "Julian H. Stacey" <jhs@berklix.com> To: Bruce Cran <bruce@cran.org.uk> Cc: hackers@freebsd.org, phk@freebsd.org Subject: Re: memstick.img is bloated with 7% 2K blocks of nulls Message-ID: <201102150019.p1F0Jjfc088901@fire.js.berklix.net> In-Reply-To: Your message "Sat, 12 Feb 2011 17:05:26 GMT." <20110212170526.00004cab@unknown>
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> But from the manual page:
>
> -f file
> Filename to use for the vnode type memory disk. Options -a
> and -t vnode are implied if not specified.
>
> So if you specify -f then you get -t vnode automatically.
Ah yes. Reading src/sbin/mdconfig/mdconfig.c with your "mdconfig
-a -f mfsroot" it seems the manual correctly represents the code
... except I'm lost what the purpose of cmdline is ?
( BTW I was wrong re:
> I suspect -t default is malloc, though manual doesnt say that
'f' actually follows with: mdio.md_type = MD_VNODE; )
Could author phk@FreeBSD.ORG cc'd (or someone else if they are clear)
please explain what cmdline is ?
Possibly commit an appended // comment after "int cmdline = 0;"
(in line 76 of 8.1 & current src/sbin/mdconfig/mdconfig.c) wgat it's for ?
(cmdline seems in most places to maybe be an enum { 1
2 3 } for { a d l } alternate forms of command mdconfig,
... & yet case 'd': sets cmdline = 3 not 2 ?
(& 't' & 'f' sets cmdline=2 ; not 1. Puzzling.
Cheers,
Julian
--
Julian Stacey, BSD Unix Linux C Sys Eng Consultants Munich http://berklix.com
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