> To: Enji Cooper <[email protected]>
> cc: "O. Hartmann" <[email protected]>,
> freebsd-current <[email protected]>, [email protected]
> Subject: Re: CURRENT: supeblock hash failure - CURRENT wrecking disks
> From: "Poul-Henning Kamp" <[email protected]>
> --------
> In message <[email protected]>, Enji Cooper
> writes
> :
>
> There is an "interesting" failure-mechanism when you move a disk
> between 13/current and older systems which do not support ufs-hashes.
>
> It will be prudent to make 11 and 12 clear the "use hashes" flags
> in the superblocks of all filesystems they mount R/W, to limit
> the amount havoc this will cause when people start playing with 13.
>
> --
> Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
> [email protected] | TCP/IP since RFC 956
> FreeBSD committer | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
Both stable-11 and stable-12 clear the "use hashes" flags. If the disk
is moved back to a 13-head system they remain disabled until reenabled
by running fsck in interactive mode and requesting that they be enabled.
Kirk McKusick
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