DragonFly BSD
DragonFly bugs List (threaded) for 2009-10
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Re: HAMMER: you can mount_hammer a UFS that was a hammer fs before

From: Jan Lentfer <Jan.Lentfer@xxxxxx>
Date: Sun, 25 Oct 2009 21:06:04 +0100

Bill Hacker schrieb:
Jan Lentfer wrote:
If a partition contains a hammer fs and you newfs it to a UFS you can afterwards still mount it as hammer fs.
You can even still run hammer info and write data on the partition (tried with dd).

? 'dd' does not know or care anything about a fs.

What happens if you not only 'newfs' to UFS, but actually *write* to it AS a r/w UFS mount? (e.g. - not with 'dd').

If hammer fs can 100% recover from that, there is witchcraft afoot....

Actuall I tried the other way and it worked: You can write data on the mount_hammer'd UFS with if=/dev/zero of=/mnt/ZEROS (which cares about the fs), umount it and mount (UFS) it. Then you will not the the created file with ls. unmount again, mount_hammer, ls and ... surprise ... data will be there again. That is nice, isn't it.



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