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

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

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 7654368..56c54a4 100644 (file)
--- 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 c33053b..a26d365 100644 (file)
--- 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);