From: Josef Bacik Date: Thu, 30 May 2013 20:55:44 +0000 (-0400) Subject: Btrfs: stop all workers before cleaning up roots X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=13e6c37b989859e70b0d73d3f2cb0aa022159b17;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git 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 Signed-off-by: Josef Bacik --- diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 7c66c2314c14..b8b60b660c8f 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -3514,13 +3514,13 @@ int close_ctree(struct btrfs_root *root) btrfs_free_block_groups(fs_info); - free_root_pointers(fs_info, 1); + btrfs_stop_all_workers(fs_info); del_fs_roots(fs_info); - iput(fs_info->btree_inode); + free_root_pointers(fs_info, 1); - btrfs_stop_all_workers(fs_info); + iput(fs_info->btree_inode); #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY if (btrfs_test_opt(root, CHECK_INTEGRITY))