Re: [PATCH] check for negative lvm sizes.

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----- "Radek Vykydal" <rvykydal@xxxxxxxxxx> wrote:

> Joel Granados Moreno wrote:
> > Hi List:
> >
> > There is a corner case in rhel4 in which changing the
> autopartitioned
> > storage in a certain way (see bug for more info
> > https://bugzilla.redhat.com/show_bug.cgi?id=144676) it will give
> > negative lvm volume sizes.  This patch checks to see if there are
> > negative values present in the calculation of the logical volume
> > request.  It raises an exception if it finds any.
> >
> > This is my, "I looked for the root of the problem, but didn't find
> it"
> > solution.  Teste a couple of times and it seems to get rid of the
> > problem.  I also tested on other installs, where the bug was not
> > present, and the patch doesn't seem to cause any problems.
> >
> > Review greatly appreciated.
> >
> >   
> 
> I haven't looked deep enough if there is any better solution
> in parts growing code.
> 
> I think your fix can get us done with the bug without
> damages. Maybe I'd prefer to give error message
> which is raised in all other cases where adding growing partition
> would mean such shrinking of VG that already existing
> LV reqests can't be satisfied. In the case
> of the bug, adding of growing part eats up all the space for
> growing VG, so growing LV is "grown" to negation
> of size of all non-growing LV requests).
> 
> The message is:
> 
> "Adding this partition would not "
> "leave enough disk space for already "
> "allocated logical volumes in ..."
> 
> and is raised after growLogicalVolumes call when we
> "    # make sure our logical volumes still fit".
> Attached patch would do it, but I don't insist much and
> am ok with your patch if you don't like it ;)

mmm.  I like the result of your view better.  The message to the user is more usefull.  I'll make a little test, and if everything goes well, I'll push your patch.

thx for review.

> 
> Just FYI, this bug is also present in RHEL5 and fedora.
> 
> 
> Radek
> 
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-- 
Joel Andres Granados
Red Hat / Brno Czech Republic

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