tree 20fa0ee3fd51a6b0ea3d1099eed52e8f609eb76f
parent 2932505abe7c56477315a3d93ffb3c27c5182e9d
author Josef Bacik <jbacik@fusionio.com> 1369947344 -0400
committer Chris Mason <chris.mason@fusionio.com> 1370718695 -0400

Btrfs: stop all workers before cleaning up roots

Dave reported a panic because the extent_root->commit_root was NULL in the
caching kthread.  That is because we just unset it in free_root_pointers, which
is not the correct thing to do, we have to either wait for the caching kthread
to complete or hold the extent_commit_sem lock so we know the thread has exited.
This patch makes the kthreads all stop first and then we do our cleanup.  This
should fix the race.  Thanks,

Reported-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>