bin/145309: bsdlabel: Editing disk label invalidates the whole device

[Andrey V. Elsukov]

On 04.02.2012 7:50, Yar Tikhiy wrote:
>  Hi there,
>  
>  Sorry but FreeBSD 9.0-RELEASE still appears to have this issue.  When
>  installed using BSD label partitioning scheme, a modification to
>  ada0's label seems to nuke the kernel's view of the disk -- I can't
>  think of a better way to explain it.  The disk itself is OK and the
>  change makes it OK to the disk but the kernel can no more use the root
>  partition until rebooted, returning weird errnos such as EIO or EXIO.
>  No idea here if the bug is limited to BSD label scheme.


Hi, Yar

When you are in single user mode your root filesystem is mounted read-only.
When you run bsdlabel it opens geom provider for writing and this triggers spoiling for it.
When bsdlabel closes provider GEOM_PART destroys it and creates again.
But VFS code seems loses it.

-- 
WBR, Andrey V. Elsukov

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