Re: CURRENT: supeblock hash failure - CURRENT wrecking disks

From: Poul-Henning Kamp <phk_at_phk.freebsd.dk>
Date: Wed, 07 Aug 2019 13:02:23 +0000
--------
In message <39FB31E6-A8EC-484C-B297-39C19A787E44_at_gmail.com>, 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
phk_at_FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.
Received on Wed Aug 07 2019 - 11:02:28 UTC

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