Btrfs: Avoid calling into the FS for the final iput on fake root inodes

Signed-off-by: Chris Mason <chris.mason@oracle.com>

2 files changed, 4 insertions, 0 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 76543683f3b9..56c54a41dbbb 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1739,6 +1739,7 @@ int close_ctree(struct btrfs_root *root)
                 free_extent_buffer(root->fs_info->dev_root->node);
 
         btrfs_free_block_groups(root->fs_info);
+        fs_info->closing = 2;
         del_fs_roots(fs_info);
 
         filemap_write_and_wait(fs_info->btree_inode->i_mapping);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index c33053ba3816..a26d365111e5 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2092,6 +2092,9 @@ int btrfs_write_inode(struct inode *inode, int wait)
         struct btrfs_trans_handle *trans;
         int ret = 0;
 
+        if (root->fs_info->closing > 1)
+                return 0;
+
         if (wait) {
                 trans = btrfs_join_transaction(root, 1);
                 btrfs_set_trans_block_group(trans, inode);