NFS: Ensure that all nfs lock contexts have a valid open context
Force the lock context to keep a reference to the parent open
context so that we can guarantee the validity of the latter.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 414a90d..efc45f2 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -885,10 +885,14 @@
spin_lock(&inode->i_lock);
res = __nfs_find_lock_context(ctx);
if (res == NULL) {
- list_add_tail_rcu(&new->list, &ctx->lock_context.list);
- new->open_context = ctx;
- res = new;
- new = NULL;
+ new->open_context = get_nfs_open_context(ctx);
+ if (new->open_context) {
+ list_add_tail_rcu(&new->list,
+ &ctx->lock_context.list);
+ res = new;
+ new = NULL;
+ } else
+ res = ERR_PTR(-EBADF);
}
spin_unlock(&inode->i_lock);
kfree(new);
@@ -906,6 +910,7 @@
return;
list_del_rcu(&l_ctx->list);
spin_unlock(&inode->i_lock);
+ put_nfs_open_context(ctx);
kfree_rcu(l_ctx, rcu_head);
}
EXPORT_SYMBOL_GPL(nfs_put_lock_context);
