Red Hat Bugzilla – Bug 186125
gfs_fsck on GFS 6.1 leaves volume in an unmountable state
Last modified: 2010-01-11 22:10:34 EST
Escalated to Bugzilla from IssueTracker
Created attachment 126424 [details]
sysreport from cluster machine
I was able to recreate this failure using a sparse device and gdb.
The problem should be easy to figure out and, with a little luck, easy to fix.
Created attachment 126571 [details]
Patch to fix the problem
This problem occurs if gfs_fsck is run on a filesystem that is more
than 5TB in size, and possibly under other conditions. What really
triggers it is when the hidden/internal resource group index file
(rgindex) has more than one level of indirection. In my recreation,
the rgindex had 20888 resource group entries.
While gfs_fsck is running, it changes the lock protocol to ensure
that noone can mount the filesystem as it is being checked.
Once the error has occurred and gfs_fsck has given up on a filesystem,
it exits, but forgets to change the lock protocol back to lock_dlm,
thus making the filesystem unusable. To make the filesystem usable
again, merely change the protocol back to lock_dlm as follows:
gfs_tool sb /dev/<your device> proto lock_dlm
The problem described by this bug was caused by an omission from
gfs_fsck's bitmap code that appears to be complete in the gfs kernel
code. This patch attempts to fix the problem. It's been tested and
works on a 5.1TB sparse device filesystem (basically, faking out the
device mapper to think the filesystem is bigger than it really is).
The fix is basically to handle the level of indirection needed rather
*** Bug 191708 has been marked as a duplicate of this bug. ***
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.