Date: Thu, 20 Jun 2002 00:25:04 +0900 From: qhwt@myrealbox.com To: Poul-Henning Kamp <phk@freebsd.org> Cc: current@freebsd.org Subject: Re: HEADSUP: UFS2 patch coming... Message-ID: <20020619152504.GB809.qhwt@myrealbox.com> In-Reply-To: <34805.1024474049@critter.freebsd.dk>
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On Wed, Jun 19, 2002 at 10:07:29AM +0200, Poul-Henning Kamp wrote:
>
> Kirk is loading and aiming is committatron with the UFS2 patch,
> expect to see it hit -current any day soon.
newfs doesn't work well with swap-backed filesystem:
# mdconfig -at swap -s 256M -u 1
# disklabel -rw md1 auto
# newfs /dev/md1c
Extent size set to 16384
/dev/md1c: 256.0MB (524288 sectors) block size 16384, fragment size 4096
using 4 cylinder groups of 64.02MB, 4097 blks, 4224 inodes.
super-block backups (for fsck -b #) at:
32, 131136, 262240, 393344
write error: 8
newfs: wtfs: Read-only file system
# /sbin.pre-ufs2/newfs /dev/md1c
/dev/md1c: 524288 sectors in 16 cylinders of 1 tracks, 32768 sectors
256.0MB in 1 cyl groups (21 c/g, 336.00MB/g, 16384 i/g)
super-block backups (for fsck -b #) at:
32
If I comment out the following part of mkfs.c, newfs doesn't fail.
@@ -535,12 +416,29 @@
if (Nflag)
exit(0);
/*
+ * Zero out the boot area to avoid old superblocks from being
+ * found by mistake. Skip over the disklabel area.
+ */
+ bzero(iobuf, sblock.fs_bsize);
+ for (i = 1; i < sblock.fs_sblkno; i += sblock.fs_frag)
+ wtfs(fsbtodb(&sblock, i), sblock.fs_bsize, iobuf);
+ /*
* Now construct the initial filesystem,
* then write out the super-block.
*/
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