On Wed, Jan 21, 2015 at 12:28 PM, Neal Becker <ndbecker2@xxxxxxxxx> wrote: >> You should do three things: if the fs is still mounted, update your >> backup; then install kernel 3.18.3 from updates-testing repo; then use >> btrfs check --repair using btrfs-progs 3.18. >> > > This is on root fs, btrfs check --repair can't be used on a mounted fs, correct? Correct. Btrfs won't even let you do a check (read only) on a mounted fs. Both xfs and ext have options to repair an ro mounted file system, both admonish this practice and consider it dangerous. > >> Since 3.17.8 didn't get this patch, and 3.17 is EOL, it won't ever get >> it. Looks like the patch is in 3.18.3, and 3.14.29. And it's easier to >> go with 3.18.3, which is in updates-testing. >> >> Next you should reboot from Fedora 21 live media, and 'dnf upgrade >> btrfs-progs' so that you have btrfs-progs 3.18.1, which is stable. And >> use 'btrfs check --repair' in case there are any missing files, this >> should find it. After this, you'd update the backup again in case the >> first one lacks the missing files. >> >> > > So you're saying to run btrfs check --repair twice? Once after > installing/rebooting 3.18.3, and then a 2nd time with live media? Nope, just once is fine. I'm saying two (incremental) backups. One now in case things go to hell with the repair, which it shouldn't at this point. And one after the repair in case it recovers missing files. The kernel update and btrfs check --repair order doesn't really matter. I would probably reboot 3.17.8 with rd.break=cmdline and see if that initramfs has btrfs v3.18.1 and if so then I'd go ahead and do the repair now, reboot -f and keep using 3.17.8. Then upgrade the kernel. Of course if you have btrfs-progs 3.18.1 now, but it's not baked into your 3.17.8 initramfs, then it's easier to just install 3.18.3 which will cause a new initramfs to be created which will pull in whatever btrfs-progs you have now, which ought to be 3.18.1 already since it's stable. -- Chris Murphy -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
