Zdenek Kabelac <zkabelac@redhat.com> on Mon, 2014/02/10 13:20: > Dne 10.2.2014 10:30, Christian Hesse napsal(a): > > Zdenek Kabelac <zkabelac@redhat.com> on Mon, 2014/02/10 09:33: > >> Dne 8.2.2014 00:55, Christian Hesse napsal(a): > >>> Christian Hesse <list@eworm.de> on Sat, 2014/02/08 00:36: > >>>> Hello everybody, > >>>> > >>>> I think I nailed it down with git bisect. My first bad commit is: > >>>> > >>>> 75628f341ad38b68aae33eae0b5700be2a6e5769 > >>>> configure: enable blkid_wiping by default if the blkid library is > >>>> present > >>>> > >>>> Looks like this wipes data that is still needed... Building a package > >>>> with '--disable-blkid_wipe' now to verify on another system. > >>> > >>> Uh, this only helps part of... > >>> > >>> I changed my test setup and used writable snapshots. After that I got: > >>> > >>> WARNING: DM_snapshot_cow signature detected on /dev/cvg/snap-home at > >>> offset 0. Wipe it? [y/n] > >>> > >>> (see https://bbs.archlinux.org/viewtopic.php?id=176504 for another > >>> report) > >>> > >>> Looks like disabling blkid_wiping fixes this. My snapshot corruption > >>> still occurs though. :-/ > >>> Bad thing about it is that the corruption does not occur reliable when > >>> doing simple tests in 'git bisect'... Out of ideas for now - Will go to > >>> bed now. > >> > >> Now this was helpful, I guess I think what is going on. > > > > Great! Waiting for patches then. :D > > > > I could provide some more information when needed: > > > > * This happens with read only snapshots only. > > * I could reproduce with commit eaa23d32732c9bc3dd4f948781b5764cf21d84ba > > (wiping: add support for blkid wiping), so it was introduced there or > > before. > > > > Should I investigate further or wait for something to test from you? > > Is the patch bellow fixing your problem ? > (It's still not final - but should help) > > Zdenek > > > diff --git a/tools/lvcreate.c b/tools/lvcreate.c > index 638a868..e8b1a7f 100644 > --- a/tools/lvcreate.c > +++ b/tools/lvcreate.c > @@ -772,7 +772,7 @@ static int _read_activation_params(struct > lvcreate_params *lp, LVM_READ | LVM_WRITE); > > /* Must not zero/wipe read only volume */ > - if (!(lp->permission & LVM_WRITE)) { > + if (!lp->snapshot && !(lp->permission & LVM_WRITE)) { > lp->zero = 0; > lp->wipe_signatures = 0; > } This looks good to me. I've made some backups now without any corruption. But with blkid_wiping enabled I do have this warning/question now for read only snapshots as well: WARNING: DM_snapshot_cow signature detected on /dev/cvg/snap-home at offset 0. Wipe it? [y/n] lvm works perfectly only with your patch applied and compiled with --disable-blkid_wiping. -- main(a){char*c=/* Schoene Gruesse */"B?IJj;MEH" "CX:;",b;for(a/* Chris get my mail address: */=0;b=c[a++];) putchar(b-1/(/* gcc -o sig sig.c && ./sig */b/42*2-3)*42);}
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