Commit fbf3fdd2 authored Sep 12, 2010 by Menyhart Zoltan Committed by Trond Myklebust Sep 12, 2010

statfs() gives ESTALE error



Hi,

An NFS client executes a statfs("file", &buff) call.
"file" exists / existed, the client has read / written it,
but it has already closed it.

user_path(pathname, &path) looks up "file" successfully in the
directory-cache  and restarts the aging timer of the directory-entry.
Even if "file" has already been removed from the server, because the
lookupcache=positive option I use, keeps the entries valid for a while.

nfs_statfs() returns ESTALE if "file" has already been removed from the
server.

If the user application repeats the statfs("file", &buff) call, we
are stuck: "file" remains young forever in the directory-cache.

Signed-off-by: Zoltan Menyhart <Zoltan.Menyhart@bull.net>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@kernel.org

parent b20d37ca

fs/nfs/super.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -431,7 +431,15 @@ static int nfs_statfs(struct dentry dentry, struct kstatfs buf)
		goto out_err;

		error = server->nfs_client->rpc_ops->statfs(server, fh, &res);
		if (unlikely(error == -ESTALE)) {
		struct dentry *pd_dentry;

		pd_dentry = dget_parent(dentry);
		if (pd_dentry != NULL) {
		nfs_zap_caches(pd_dentry->d_inode);
		dput(pd_dentry);
		}
		}
		nfs_free_fattr(res.fattr);
		if (error < 0)
		goto out_err;

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