if you try grub-install to a fresh /boot on xfs, it will usually hang. It appears to be an issue with the validation that happens in grub-install, when it uses grub to dump out the various files to be sure they were written correctly. (?) The symptom is that grub is hung in the xfs driver code (in grub), due to having stumbled upon some "bad" (or inconsistent) metadata on disk. I believe this is because in general, it is not safe to assume that you have a consistent, valid filesystem present on your mounted block device after typing "sync" - if you think about it, there's a reason that dm-snapshot *freezes* the filesystem before taking a snap of the block device, the same principle applies here. I modified grub-install to use xfs_freeze/thaw on /boot before & after grub dump was invoked; this did indeed resolve the problem, but it's not a good general solution - /boot may be part of your root fs, and freezing root leads to trouble. Plus, grub-install wants to write that image *somewhere* and can't if the sole fs is frozen. So this may come down to what this test is trying to achieve, i.e. what failure it is trying to catch; if it wishes to use grub code to actually traverse the filesystem in the same manner as it will need to at boot time, then I don't have a great suggestion; as mentioned before, without either unmounting, or freezing, the filesystem, you don't have any assurance of a valid block device to test. If it's simply trying to verify that the files in question are in the blocks it thinks they are, then something like FIBMAP calls may be more appropriate to check with the filesystem about file locations.
FWIW I confirmed w/ dchinner that "sync" gets xfs metadata only as far as the log - where grub will never find it. While this exact behavior may be specific to xfs, I'll still maintain that it's not safe in general to read a rw-mounted block device and expect to find a consistent filesystem....
Based on the date this bug was created, it appears to have been reported during the development of Fedora 8. In order to refocus our efforts as a project we are changing the version of this bug to '8'. If this bug still exists in rawhide, please change the version back to rawhide. (If you're unable to change the bug's version, add a comment to the bug and someone will change it for you.) Thanks for your help and we apologize for the interruption. The process we're following is outlined here: http://fedoraproject.org/wiki/BugZappers/F9CleanUp We will be following the process here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping to ensure this doesn't happen again.
yeah, it still exists in rawhide. however, Peter, if you want to close this with "we don't support boot on anything but ext2 and ext3" I won't complain.
Changing version to '9' as part of upcoming Fedora 9 GA. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
I'll close it as such :-)
FWIW, recent proposed upstream changes may actually make xfs behave better in the face of grub's mistaken expectations .... :) So worth trying this again after that makes it upstream...
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