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Btrfs: fix accessing a freed tree root

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inode_tree_del() will move the tree root into the dead root list, and
then the tree will be destroyed by the cleaner. So if we remove the
delayed node which is cached in the inode after inode_tree_del(),
we may access a freed tree root. Fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Miao Xie 2013-05-15 07:48:15 +00:00 committed by Josef Bacik
parent b9aa55bed1
commit 89042e5ad2
1 changed files with 1 additions and 1 deletions
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2
fs/btrfs/inode.c
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@ -4727,6 +4727,7 @@ void btrfs_evict_inode(struct inode *inode)
btrfs_end_transaction(trans, root);
btrfs_btree_balance_dirty(root);
no_delete:
btrfs_remove_delayed_node(inode);
clear_inode(inode);
return;
}
@ -7982,7 +7983,6 @@ void btrfs_destroy_inode(struct inode *inode)
inode_tree_del(inode);
btrfs_drop_extent_cache(inode, 0, (u64)-1, 0);
free:
btrfs_remove_delayed_node(inode);
call_rcu(&inode->i_rcu, btrfs_i_callback);
}