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From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no>
To: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
References: <35438.1219736614@critter.freebsd.dk> <86zln011dz.fsf@ds4.des.no>
Date: Tue, 26 Aug 2008 13:20:23 +0200
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	=?utf-8?Q?rav=22's?= message of "Tue, 26 Aug 2008 13:06:32 +0200")
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Cc: freebsd-fs@freebsd.org
Subject: Re: Sector size of 4096 bytes (not 512)
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Dag-Erling Sm=C3=B8rgrav <des@des.no> writes:
> Doesn't newfs figure this out on its own, based on the parameters
> reported by ata / cam?

It does, actually:

        if (sectorsize =3D=3D 0)
                if (ioctl(disk.d_fd, DIOCGSECTORSIZE, &sectorsize) =3D=3D -=
1)
                        sectorsize =3D 0; /* back out on error for safety */
        /* ... */
        if (fsize <=3D 0)
                fsize =3D MAX(DFL_FRAGSIZE, sectorsize);
        if (bsize <=3D 0)
                bsize =3D MIN(DFL_BLKSIZE, 8 * fsize);

If I read the sysinstall code correctly, it won't specify a block and
fragment size unless you actually press 'N' to set custom options - at
which point it will initialize them to "-b 16384 -f 2048" (which are the
newfs defaults for disks with sector sizes <=3D 2048) before displaying
the dialog box where you can edit them.

DES
--=20
Dag-Erling Sm=C3=B8rgrav - des@des.no