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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>
This commit is contained in:
Trond Myklebust 2019-04-07 13:59:10 -04:00 committed by Anna Schumaker
parent 0688e64bc6
commit 154945112d
1 changed files with 9 additions and 4 deletions
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13
fs/nfs/inode.c
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@ -885,10 +885,14 @@ struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
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 @@ void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
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);