[lvm-devel] [PATCH] Fix mirror -> mirror up-converts

[Jonathan Brassow]

Please refer to the following previous threads for history on this
subject:
https://www.redhat.com/archives/lvm-devel/2008-July/msg00026.html
https://www.redhat.com/archives/lvm-devel/2008-February/msg00007.html

Associated Bug:
https://bugzilla.redhat.com/show_bug.cgi?id=455670
(potentially others, including 460222)

The main issue is that with the current code, it is possible to activate
2 device-mapper tables that evaluate to the same thing... meaning you
can have 2 uncoordinated recovery processes happening at the same time
in conjunction with I/O streams.  (I.e.  corruption is a distinct
possibility.)  The attached patches prevent this "double activation".

There are 2 patches attached - one device-mapper patch adding the
'preload, but don't resume' function and another with the required LVM
changes.  (Please note that I've disallowed the resizing of LVs while
they have the 'CONVERTING' flag.)

 brassow


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