Re: [git pull] first batch of ufs fixes

[Al Viro]

On Sun, Jun 11, 2017 at 12:47:40PM -0700, Richard Narron wrote:
> 1) Creating an OpenBSD 6.1 (44bsd) disk and then on Linux copying a large >
> 2GB file and creating a directory, there are errors on OpenBSD
> with the fsck:
> 
> OpenBSD (44bsd):
>   #fsck sd0e
>   ** /dev/rsd0e
>   ** File system is already clean
>   ** Last Mounted on /diske
>   ** Phase 1 - Check Blocks and Sizes
>   ** Phase 2 - Check Pathnames
>   ** Phase 3 - Check Connectivity
>   ** Phase 4 - Check Reference Counts
>   ** Phase 5 - Check Cyl groups
>   FREE BLK COUNT(S) WRONG IN SUPERBLK
>   SALVAGE? [Fyn?]
>   3 files, 1272410 used, 6983197 free (13 frags, 872898 blocks, 0.0% fragmentation)
> 
>   ***** FILE SYSTEM WAS MODIFIED *****

Can't reproduce...
# fsck -f /dev/rwd1c
** /dev/rwd1c
** File system is already clean
** Last Mounted on
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
3 files, 1573258 used, 489445 free (13 frags, 61179 blocks, 0.0% fragmentation)
# uname -mrsv
OpenBSD 6.1 GENERIC#19 amd64
# file -s /dev/rwd1c 
/dev/rwd1c: Unix Fast File system [v1] (little-endian), last mounted on , last written at Mon Jun 12 06:03:57 2017, clean flag 1, number of blocks 2097152, number of data blocks 2062703, number of cylinder groups 21, block size 16384, fragment size 2048, minimum percentage of free blocks 5, rotational delay 0ms, disk rotational speed 60rps, TIME optimization

That's after
# mkdir /mnt/a; dd if=/dev/zero of=/mnt/a/foo bs=1M count=3072
on the Linux side, with
root@kvm1:~# uname -msrv
Linux 4.12.0-rc1+ #112 SMP Fri Jun 9 17:16:00 EDT 2017 x86_64
there.  -o loop mount on Linux (image living on 9p), direct -hdb ../9p/ufs on OpenBSD side
of things (both in KVM on the same host)...

Reproducer would be nice - ideally on the level of "device is this large, newfs was with
such and such options, series of operations done on the Linux side after mounting that
sucker".